1600
The square of 40.
16002 = 02560000, 56002 = 31360000, 36002 = 12960000, 96002 = 92160000,
Other examples: 2916 - 5030 - 3009 - 0540 - 2916, and 2100 - 4100 - 8100 - 6100 - 2100.
by Yoshio Mimura, Kobe, Japan
1602
S2(1602) = S2(742) + S2(1547), where S2(n) = 12 + 22 + 32 + ... + n2.
16022 = 34 + 214 + 334 + 334.
16022 = (12 + 2)(42 + 2)(2182 + 2).
Komachi equation: 16022 = 122 * 32 * 42 / 562 * 72 * 892.
Page of Squares : First Upload February 13, 2007 ; Last Revised December 14, 2013by Yoshio Mimura, Kobe, Japan
1603
1 / 1603 = 0.000623830318, 62 + 232 + 82 + 302 + 32 + 12 + 82 = 1603.
Page of Squares : First Upload February 13, 2007 ; Last Revised February 13, 2007by Yoshio Mimura, Kobe, Japan
1604
16042 = 2572816, 2 + 57 * 28 + 1 * 6 = 2 + 57 * 28 * 1 + 6 = 1604.
Page of Squares : First Upload February 13, 2007 ; Last Revised February 13, 2007by Yoshio Mimura, Kobe, Japan
1605
The square root of 1605 is 40.062..., and 40 = 02 + 62 + 22.
Page of Squares : First Upload February 13, 2007 ; Last Revised February 13, 2007by Yoshio Mimura, Kobe, Japan
1607
16072 = 93 + 563 + 1343.
Page of Squares : First Upload July 10, 2008 ; Last Revised July 10, 2008by Yoshio Mimura, Kobe, Japan
1608
16082 = 483 + 613 + 1313.
Page of Squares : First Upload July 10, 2008 ; Last Revised July 10, 2008by Yoshio Mimura, Kobe, Japan
1611
16112 = 2595321, 2 - 5 + 9 + 5 * 321 = 1611.
16112± 2 are primes.
16112 = 323 + 1053 + 1123.
Page of Squares : First Upload February 13, 2007 ; Last Revised December 29, 2013by Yoshio Mimura, Kobe, Japan
1612
16122 = (72 + 3)(112 + 3)(202 + 3).
16122 = 302 + 312 + 322 + 332 + 342 + 352 + 362 + ... + 1982.
A cubic polynomial:
(X + 14402)(X + 16122)(X + 58592) = X3 + 62452X2 + 128752922X + 136003795202.
by Yoshio Mimura, Kobe, Japan
1614
786k + 1614k + 3882k + 4122k are squares for k = 1,2,3 (1022, 59402, 3650042).
48k + 177k + 186k + 1614k are squares for k = 1,2,3 (452, 16352, 649352).
by Yoshio Mimura, Kobe, Japan
1615
293930k + 529720k + 687990k + 1096585k are squares for k = 1,2,3 (16152, 14292752, 13484523252).
Page of Squares : First Upload April 28, 2011 ; Last Revised April 28, 2011by Yoshio Mimura, Kobe, Japan
1616
1 / 1616 = 0.000618811881188118811, 6182 + 812 + 12 + 8812 + 1882 + 11882 + 112 = 16162,
1 / 1616 = 0.000618811881188118811, 6182 + 812 + 1882 + 11882 + 112 + 8812 + 12 = 16162.
by Yoshio Mimura, Kobe, Japan
1617
16172± 2 are primes.
16172 = 503 + 703 + 1293.
1617k + 8106k + 10290k + 15708k are squares for k = 1,2,3 (1892, 205172, 23456792).
294k + 1288k + 1617k + 2730k are squares for k = 1,2,3 (772, 34372, 1635132).
924k + 1078k + 1617k + 2310k are squares for k = 1,2,3 (772, 31572, 1363672).
by Yoshio Mimura, Kobe, Japan
1618
16182 = 234 + 294 + 294 + 314.
Page of Squares : First Upload July 10, 2008 ; Last Revised July 10, 2008by Yoshio Mimura, Kobe, Japan
1619
16192 = 2621161, a square with just 3 kinds of digits 1, 2 and 6.
Page of Squares : First Upload February 13, 2007 ; Last Revised February 13, 2007by Yoshio Mimura, Kobe, Japan
1620
A cubic polynomial :
(X + 16202)(X + 20792)(X + 44002) = X3 + 51292X2 + 120760202X + 148191120002.
16202 = (1)(2)(3)(4)(5 + 6 + 7 + ... + 10)(11 + 12 + 13 + ... + 70),
16202 = (1)(2)(3)(4)(5 + 6 + 7 + ... + 22)(23 + 24 + 25 + ... + 37),
16202 = (1)(2)(3)(4 + 5)(6)(7 + 8)(9)(10 + 11 + 12 + 13 + 14),
16202 = (1)(2 + 3)(4)(5 + 6 + 7 + ... + 13)(14 + 15 + 16 + ... + 58),
16202 = (1)(2 + 3)(4)(5 + 6 + 7)(8 + 9 + 10)(11 + 12 + 13 + ... + 25),
16202 = (1)(2 + 3)(4 + 5)(6 + 7 + 8 + 9)(10 + 11 + 12 + ... + 17)(18),
16202 = (1)(2 + 3)(4 + 5 + 6 + 7 + 8)(9)(10 + 11 + 12 + ... + 17)(18),
16202 = (1)(2 + 3 + 4 + ... + 7)(8)(9)(10)(11 + 12 + 13 + ... + 19),
16202 = (1)(2 + 3 + 4 + ... + 7)(8 + 9 + 10)(11 + 12 + 13 + ... + 85),
16202 = (1)(2 + 3 + 4)(5)(6 + 7 + ... + 9)(10 + 11 + 12 + ... + 17)(18),
16202 = (1)(2 + 3 + 4)(5 + 6 + 7)(8 + 9 + 10 + ... + 22)(23 + 24 + 25),
16202 = (1 + 2)(3)(4)(5)(6)(7 + 8 + 9 + 10 + 11)(12 + 13 + 14 + 15),
16202 = (1 + 2)(3)(4)(5 + 6 + 7 + ... + 10)(11 + 12 + 13)(14 + 15 + 16),
16202 = (1 + 2)(3)(4)(5 + 6 + 7 + ... + 19)(20 + 21 + 22 + ... + 34),
16202 = (1 + 2)(3)(4 + 5)(6)(7 + 8)(9 + 10 + 11)(12),
16202 = (1 + 2)(3)(4 + 5)(6 + 7 + 8 + ... + 14)(15 + 16 + 17 + ... + 30),
16202 = (1 + 2)(3)(4 + 5 + 6 + ... + 11)(12)(13 + 14)(15),
16202 = (1 + 2)(3)(4 + 5 + 6 + ... + 11)(12 + 13 + 14 + 15)(16 + 17 + 18 + 19 + 20),
16202 = (1 + 2)(3)(4 + 5 + 6 + 7 + 8)(9 + 10 + 11)(12)(13 + 14),
16202 = (1 + 2)(3)(4 + 5 + 6)(7 + 8 + 9)(10)(11 + 12 + 13 + ... + 16),
16202 = (1 + 2)(3 + 4 + 5 + 6)(7 + 8)(9)(10)(11 + 12 + 13),
16202 = (1 + 2)(3 + 4 + 5 + 6 + 7)(8 + 9 + 10 + ... + 19)(20 + 21 + 22 + ... + 28),
16202 = (1 + 2 + 3 + 4)(5 + 6 + 7 + ... + 10)(11 + 12 + 13)(14 + 15 + 16 + ... + 22),
16202 = (1 + 2 + 3 + 4)(5 + 6 + 7 + ... + 724),
16202 = (1 + 2 + 3 + 4)(5 + 6 + 7)(8 + 9 + 10)(11 + 12 + 13 + ... + 34),
16202 = (1 + 2 + 3 + 4 + 5)(6 + 7 + 8 + 9 + 10)(11 + 12 + 13 + ... + 16)(17 + 18 + 19),
16202 = (1 + 2 + 3 + ... + 9)(10)(11 + 12 + 13)(14 + 15 + 16 + ... + 22),
16202 = (1 + 2 + 3)(4)(5 + 6 + 7 + ... + 10)(11 + 12 + 13 + ... + 70),
16202 = (1 + 2 + 3)(4)(5 + 6 + 7 + ... + 22)(23 + 24 + 25 + ... + 37),
16202 = (1 + 2 + 3)(4 + 5)(6)(7 + 8)(9)(10 + 11 + 12 + 13 + 14).
by Yoshio Mimura, Kobe, Japan
1621
The square root of 1621 is 40.26..., and 40 = 22 + 62.
16212 = 2627641 appears in the decimal expressions of e:
e = 2.71828•••2627641••• (from the 48086th digit)
by Yoshio Mimura, Kobe, Japan
1623
16232 = 63 + 1063 + 1133.
Page of Squares : First Upload July 10, 2008 ; Last Revised July 10, 2008by Yoshio Mimura, Kobe, Japan
1624
16242 = 2637376, a zigzag square.
16242± 3 are primes.
16242 = (72 + 7)(142 + 7)(152 + 7) = (72 + 7)(2172 + 7).
S2(1624) = S2(9) * S2(12) * S2(28), where S2(n) = 12 + 22 + 32 + ... + n2.
16242 = 503 + 803 + 1263.
Page of Squares : First Upload February 13, 2007 ; Last Revised January 16, 2014by Yoshio Mimura, Kobe, Japan
1625
16252 = 2640625, 22 + 62 + 42 + 02 + 62 + 22 + 52 = 112.
16252 = 413 + 783 + 1283.
Page of Squares : First Upload February 13, 2007 ; Last Revised July 10, 2008by Yoshio Mimura, Kobe, Japan
1626
16262 = 2643876, 26 + 4 + 38 * 7 * 6 = 1626.
Page of Squares : First Upload February 13, 2007 ; Last Revised February 13, 2007by Yoshio Mimura, Kobe, Japan
1628
16282 = 2650384, a square with different digits.
16282± 3 are primes.
Page of Squares : First Upload February 13, 2007 ; Last Revised January 16, 2014by Yoshio Mimura, Kobe, Japan
1632
16322 = 923 + 963 + 1003.
16322 = 2663424, 22 + 62 + 62 + 32 + 42 + 22 + 42 = 112.
16322 = 2663424, 2 * 6 / 6 * 34 * 24 = 2 / 6 * 6 * 34 * 24 = 1632,
16322 = 2663424, 26 * 63 - 4 + 2 - 4 = 26 * 63 - 4 / 2 - 4 = 1632.
16322 = (32 - 1)(5772 - 1).
Page of Squares : First Upload February 13, 2007 ; Last Revised December 14, 2013by Yoshio Mimura, Kobe, Japan
1633
16332 = 2666689, a square the digits of which are non-decreasing.
16332 = 2666689, 26 * 66 + 6 - 89 = 1633.
16332 = 203 + 803 + 1293.
Page of Squares : First Upload February 13, 2007 ; Last Revised July 10, 2008by Yoshio Mimura, Kobe, Japan
1634
16342 = 2669956 appears in the decimal expressions of π:
π = 3.14159•••2669956••• (from the 80656st digit)
by Yoshio Mimura, Kobe, Japan
1635
16352 + 16362 + 16372 + ... + 24702 = 24712 + 24722 + 24732 + ... + 29542.
48k + 177k + 186k + 1614k are squares for k = 1,2,3 (452, 16352, 649352).
Page of Squares : First Upload April 28, 2011 ; Last Revised September 9, 2011by Yoshio Mimura, Kobe, Japan
1638
The integral triangle of sides 1869, 2873, 3370 has square area 16382.
Komachi eqaution: 16382 = 12 / 22 / 32 / 42 * 562 * 782 * 92.
16382 = (74 + 75 + 76)2 + (77 + 78 + 79)2 + (80 + 81 + 82)2 + ... + (143 + 144 + 145)2.
16382 = (1)(2)(3)(4 + 5)(6 + 7)(8 + 9 + ... + 20)(21),
16382 = (1)(2)(3 + 4)(5 + 6 + 7 + 8)(9)(10 + 11)(12 + 13 + 14),
16382 = (1)(2 + 3 + 4 + 5)(6 + 7)(8 + 9 + 10 + ... + 13)(14 + 15 + 16 + ... + 25),
16382 = (1)(2 + 3 + 4 + 5)(6 + 7 + 8 + ... + 12)(13)(14 + 15 + 16 + ... + 25),
16382 = (1)(2 + 3 + 4 + 5)(6 + 7 + 8 + ... + 57)(58 + 59),
16382 = (1)(2 + 3 + 4 + 5)(6 + 7 + 8)(9 + 10 + 11 + ... + 17)(18 + 19 + 20 + 21),
16382 = (1)(2 + 3 + 4)(5 + 6 + 7 + 8)(9 + 10 + 11 + 12)(13 + 14 + 15 + ... + 26),
16382 = (1 + 2)(3 + 4)(5 + 6 + 7 + 8)(9 + 10 + 11 + ... + 99),
16382 = (1 + 2)(3 + 4 + 5 + ... + 15)(16 + 17 + 18 + ... + 23)(24 + 25),
16382 = (1 + 2 + 3 + ... + 13)(14)(15 + 16 + ... + 66),
16382 = (1 + 2 + 3 + ... + 13)(14 + 15 + ... + 22)(23 + 24 + 25 + ... + 29),
16382 = (1 + 2 + 3 + ... + 6)(7 + 8 + 9 + ... + 19)(20 + 21 + 22 + ... + 43),
16382 = (1 + 2 + 3 + ... + 6)(7 + 8 + 9 + ... + 32)(33 + 34 + 35 + ... + 39),
16382 = (1 + 2 + 3)(4 + 5)(6 + 7)(8 + 9 + 10 + ... + 20)(21).
by Yoshio Mimura, Kobe, Japan
1639
16392 = 2686321, 268 * 6 + 32 - 1 = 1639 .
Page of Squares : First Upload February 13, 2007 ; Last Revised February 13, 2007by Yoshio Mimura, Kobe, Japan
1640
16402 = 2689600 appears in the decimal expressions of π:
π = 3.14159•••2689600••• (from the 80129th digit)
by Yoshio Mimura, Kobe, Japan
1642
16422 = 2696164, a square pegged by 6.
Page of Squares : First Upload February 13, 2007 ; Last Revised February 13, 2007by Yoshio Mimura, Kobe, Japan
1643
S2(1643) = S2(1239) + S2(1363).
16432 = 623 + 683 + 1293.
Page of Squares : First Upload February 13, 2007 ; Last Revised July 10, 2008by Yoshio Mimura, Kobe, Japan
1644
16444 = 7304781885696, and 72 + 302 + 42 + 72 + 82 + 182 + 82 + 52 + 62 + 92 + 62 = 1644.
Page of Squares : First Upload December 1, 2008 ; Last Revised December 1, 2008by Yoshio Mimura, Kobe, Japan
1645
16452 = 2706025, 270 * 6 + 0 + 25 = 1645.
1645k + 54285k + 56165k + 108805k are squares for k = 1,2,3 (4702, 1339502, 403142502).
141k + 1645k + 2773k + 4277k are squares for k = 1,2,3 (942, 53582, 3225142).
Komachi equation: 16452 = 9872 * 62 / 542 * 32 / 22 * 102.
Page of Squares : First Upload February 13, 2007 ; Last Revised April 28, 2011by Yoshio Mimura, Kobe, Japan
1646
16462 = 2709316, a square with different digits.
16462± 3 are primes.
16462 = 363 + 1093 + 1113.
16465 = 12082287187210976 : 12 + 22 + 02 + 82 + 222 + 82 + 72 + 182 + 72 + 212 + 02 + 92 + 72 + 62 = 1646.
Page of Squares : First Upload February 13, 2007 ; Last Revised January 16, 2014by Yoshio Mimura, Kobe, Japan
1648
16482 = 2715904, a square with different digits.
16482 = 84 + 284 + 324 + 324.
Page of Squares : First Upload February 13, 2007 ; Last Revised July 10, 2008by Yoshio Mimura, Kobe, Japan
1649
16492 = 104 + 204 + 324 + 354 = 154 + 304 + 304 + 324.
85k + 1649k + 4097k + 4573k are squares for k = 1,2,3 (1022, 63582, 4109582).
336396k + 463369k + 728858k + 1190578k are squares for k = 1,2,3 (16492, 15088352, 14874029472).
474912k + 534276k + 745348k + 964665k are squares for k = 1,2,3 (16492, 14131932, 12535516612).
16495 = 12192795175283249 :
122 + 12 + 92 + 22 + 72 + 92 + 52 + 12 + 72 + 52 + 22 + 82 + 322 + 42 + 92 = 1649.
by Yoshio Mimura, Kobe, Japan
1650
The square root of 1650 is 40.62..., and 40 = 62 + 22.
The integral triangle of sides 521, 12104, 12375 has square area 16502.
16502 = (1)(2 + 3)(4)(5 + 6)(7 + 8)(9 + 10 + 11 + ... + 41),
16502 = (1)(2 + 3)(4 + 5)(6 + 7 + 8 + ... + 49)(50),
16502 = (1)(2 + 3)(4 + 5 + 6 + 7)(8 + 9 + 10 + ... + 17)(18 + 19 + 20 + ... + 26),
16502 = (1)(2 + 3 + 4 + ... + 9)(10 + 11 + 12)(13 + 14 + 15 + ... + 62),
16502 = (1)(2 + 3 + 4)(5)(6 + 7 + ... + 49)(50),
16502 = (1 + 2 + 3 + 4)(5)(6 + 7 + 8 + ... + 27)(28 + 29 + 30 + 31 + 32),
16502 = (1 + 2 + 3 + 4)(5 + 6 + 7 + ... + 10)(11 + 12 + 13 + ... + 110),
16502 = (1 + 2 + 3 + ... + 9)(10)(11 + 12 + 13 + ... + 110).
16502 = (22 + 6)(32 + 6)(72 + 6)(182 + 6) = (32 + 6)(42 + 6)(72 + 6)(122 + 6)
= (72 + 6)(122 + 6)(182 + 6).
by Yoshio Mimura, Kobe, Japan
1652
16522± 3 are primes.
Page of Squares : First Upload January 16, 2014 ; Last Revised January 16, 2014by Yoshio Mimura, Kobe, Japan
1653
16532 = 13 + 23 + 33 + 43 + 53 + ... + 573.
281010k + 608304k + 629793k + 1213302k are squares for k = 1,2,3 (16532, 15224132, 15110221772).
Page of Squares : First Upload February 13, 2007 ; Last Revised April 28, 2011by Yoshio Mimura, Kobe, Japan
1656
16562 = 423 + 643 + 1343.
16564 = 7520406736896, and 72 + 52 + 22 + 02 + 42 + 02 + 62 + 72 + 362 + 82 + 92 + 62 = 1656.
Page of Squares : First Upload July 10, 2008 ; Last Revised December 1, 2008by Yoshio Mimura, Kobe, Japan
1659
16592 = 2752281, 2 + 75 * 22 + 8 - 1 = 1659.
Page of Squares : First Upload February 13, 2007 ; Last Revised February 13, 2007by Yoshio Mimura, Kobe, Japan
1662
16622 = 2762244, 27 * 62 - 2 * 4 - 4 = 1662.
Page of Squares : First Upload February 13, 2007 ; Last Revised February 13, 2007by Yoshio Mimura, Kobe, Japan
1663
16632 = 2765569, 22 + 72 + 62 + 52 + 52 + 62 + 92 = 162.
Page of Squares : First Upload February 13, 2007 ; Last Revised February 13, 2007by Yoshio Mimura, Kobe, Japan
1664
16642 = 63 + 523 + 1383 = 103 + 1043 + 1183.
Komachi equation: 16642 = 12 * 2342 * 562 / 72 * 82 / 92.
Page of Squares : First Upload July 10, 2008 ; Last Revised September 7, 2010by Yoshio Mimura, Kobe, Japan
1665
16652 = 2772225, a square with just 3 kinds of digits.
Page of Squares : First Upload February 13, 2007 ; Last Revised February 13, 2007by Yoshio Mimura, Kobe, Japan
1666
16662 = 2775556, 2 + 7 + 7 + 5 * 55 * 6 = 2 + 7 + 7 + 55 * 5 * 6 = 1666.
16662 = 633 + 693 + 1303.
1666k + 2210k + 5270k + 9350k are squares for k = 1,2,3 (1362, 110842, 9895362).
Page of Squares : First Upload February 13, 2007 ; Last Revised April 28, 2011by Yoshio Mimura, Kobe, Japan
1667
16672 = 2778889, the digits of which are non-decreasing.
16672 = 2778889 appears in the decimal expressions of π:
π = 3.14159•••2778889••• (from the 47042nd digit)
by Yoshio Mimura, Kobe, Japan
1668
16682 = 2782224, 278 / 2 / 2 * 24 = 1668.
16682 = 164 + 244 + 324 + 344.
138k + 570k + 1086k + 1122k are squares for k = 1,2,3 (542, 16682, 536762).
210k + 606k + 762k + 1338k are squares for k = 1,2,3 (542, 16682, 554042).
by Yoshio Mimura, Kobe, Japan
1669
16692 = 2785561, 278 * 5 / 5 * 6 + 1 = 278 / 5 * 5 * 6 + 1 = 1669.
Page of Squares : First Upload February 13, 2007 ; Last Revised February 13, 2007by Yoshio Mimura, Kobe, Japan
1671
(16712 + 9) = (42 + 9)(52 + 9)(62 + 9)(82 + 9) = (12 + 9)(42 + 9)(82 + 9)(122 + 9).
16712 = 2792241 appears in the decimal expressions of π:
π = 3.14159•••2792241••• (from the 16310th digit)
(2792241 is the third 7-digit square in the expression of π.)
by Yoshio Mimura, Kobe, Japan
1673
16732 = 253 + 343 + 1403 = 15 + 35 + 135 + 145 + 185.
The sum of the squares of divisors of 1673 is a square, 16902.
Page of Squares : First Upload July 10, 2008 ; Last Revised November 1, 2011by Yoshio Mimura, Kobe, Japan
1674
16742 = 2802276, 2 + 8 * 0 + 22 * 76 = 2 - 8 * 0 + 22 * 76 = 1674 .
Page of Squares : First Upload February 13, 2007 ; Last Revised February 13, 2007by Yoshio Mimura, Kobe, Japan
1679
16792 = 2819041, a zigzag square.
16792 = 2819041, 2 * 819 + 0 + 41 = 1679.
1679^2 = 83^3 + 93^3 + 113^3.
Page of Squares : First Upload February 13, 2007 ; Last Revised July 10, 2008by Yoshio Mimura, Kobe, Japan
1680
16802 = 103 + 633 + 1373.
1680, 1681, 1682, 1683 and 1684 are five consecutive integers having square factors (the second case).
The integral triangle of sides 1521, 3712, 3983 (or 1904, 4285, 5811) has square area 16802.
Komachi equations:
16802 = 122 * 32 / 42 + 52 * 62 * 72 * 82 - 92 = 122 * 32 / 42 * 52 * 62 * 72 * 82 / 92
= 122 * 32 * 452 / 62 * 72 * 82 / 92 = - 122 * 32 / 42 + 52 * 62 * 72 * 82 + 92.
A quartic polynomial: (See 420)
(X + 420)(X + 525)(X + 1344)(X + 1680) = X4 + 632X3 + 23102X2 + 529202X + 7056002.
16802 = (172 - 1)(992 - 1) = (22 - 1)(32 - 1)(42 - 1)(62 - 1)(152 - 1)
= (22 - 1)(62 - 1)(112 - 1)(152 - 1) = (42 - 1)(152 - 1)(292 - 1)
= (42 - 1)(52 - 1)(62 - 1)(152 - 1) = (62 - 1)(152 - 1)(192 - 1) = (62 - 1)(72 - 1)(412 - 1).
16802 = (1)(2)(3)(4)(5 + 6 + 7 + ... + 11)(12)(13 + 14 + 15 + ... + 22),
16802 = (1)(2)(3 + 4)(5)(6)(7 + 8 + 9)(10 + 11 + 12 + ... + 25),
16802 = (1)(2)(3 + 4)(5 + 6 + 7 + ... + 11)(12)(13 + 14 + 15 + ... + 27),
16802 = (1)(2 + 3)(4)(5)(6)(7)(8)(9 + 10 + 11 + ... + 15),
16802 = (1)(2 + 3)(4)(5)(6 + 7 + 8 + ... + 26)(27 + 28 + 29),
16802 = (1)(2 + 3)(4)(5)(6 + 7 + 8)(9 + 10 + 11 + ... + 15)(16),
16802 = (1)(2 + 3 + 4 + 5)(6 + 7 + ... + 10)(11 + 12 + 13)(14 + 15 + ... + 21),
16802 = (1)(2 + 3 + 5 + 6)(7)(8)(9)(10 + 11 + 12 + ... + 25),
16802 = (1)(2 + 3 + 4 + 5 + 6)(7)(8)(9 + 10 + 11 + ... + 71),
16802 = (1)(2 + 3 + 4 + 5 + 6)(7 + 8 + 9 + ... + 21)(22 + 23 + 24 + ... + 42),
16802 = (1 + 2)(3 + 4 + 5 + 6 + 7)(8)(9 + 10 + 11 + 12)(13 + 14 + 15 + ... + 19),
16802 = (1 + 2 + 4)(5 + 6 + 7 + ... + 11)(12 + 13 + 14 + ... + 23)(24),
16802 = (1 + 2 + 3 + ... + 6)(7 + 8 + 9 + ... + 518),
16802 = (1 + 2 + 3 + ... + 7)(8)(9 + 10 + 11 + ... + 12)(13 + 14 + 15 + ... + 27),
16802 = (1 + 2 + 3 + ... + 7)(8 + 9 + 10 + ... + 27)(28 + 29 + 30 + ... + 36),
16802 = (1 + 2 + 3)(4)(5 + 6 + 7 + ... + 11)(12)(13 + 14 + 15 + ... + 22).
by Yoshio Mimura, Kobe, Japan
1681
The square of 41.
1681 = 412, 16 = 42, 81 = 92.
1 + 2 + 3 + 4 + 5 + 6 + ... + 1681 = 11892.
16812 - 16802 - 16792 + 16782 - 16772 + ... + 12 = 11892.
A cubic polynomial :
(X + 5762)(X + 7442)(X + 13932) = X3 + 16812X2 + 13789682X + 5969617922.
16812 = 2825761, 2 * 8 / 2 * 5 * 7 * 6 + 1 = 1681.
Loop of length 56 by the function f(N) = ... + c2 + b2 + a2 where N = ... + 1002c + 100b + a:
1681 - 6817 - 4913 - 2570 - ... - 1809 - 405 - 41 - 1681
(Note f(1681) = 162 + 812 = 6817, f(6817) = 682 + 172 = 4913, etc. See 41)
16812 = 2825761 appears in the decimal expressions of e:
e = 2.71828•••2825761••• (from the 37236th digit)
(2825761 is the tenth 7-digit square in the expression of e.)
by Yoshio Mimura, Kobe, Japan
1682
16822 = 2829124, 2 * 829 + 1 * 24 = 2 * 829 * 1 + 24 = 1682.
16822 = 294 + 294 + 294 + 294.
Page of Squares : First Upload February 13, 2007 ; Last Revised July 10, 2008by Yoshio Mimura, Kobe, Japan
1683
16832 = (1)(2 + 3 + 4 + 5 + 6 + 7)(8 + 9)(10 + 11 + 12 + ... + 111).
16832 = (12 + 2)(32 + 2)(72 + 2)(412 + 2) = (32 + 8)(52 + 8)(712 + 8).
51k + 1683k + 6069k + 10693k are squares for k = 1,2,3 (1362, 124102, 12045522).
18k + 282k + 921k + 1380k are squares for k = 1,2,3 (512, 16832, 585812).
by Yoshio Mimura, Kobe, Japan
1684
A cubic polynomial :
(X + 3362)(X + 16842)(X + 107732) = X3 + 109092X2 + 185079722X + 60956219522.
by Yoshio Mimura, Kobe, Japan
1686
16862 = 2842596, 2 * 842 + 5 - 9 + 6 = 1686.
Page of Squares : First Upload February 13, 2007 ; Last Revised February 13, 2007by Yoshio Mimura, Kobe, Japan
1687
452116k + 705166k + 767585k + 921102k are squares for k = 1,2,3 (16872, 14626292, 12949158952).
Page of Squares : First Upload April 28, 2011 ; Last Revised April 28, 2011by Yoshio Mimura, Kobe, Japan
1688
(16882 - 8) = (52 - 8)(72 - 8)(82 - 8)(92 - 8) = (32 - 8)(52 - 8)(72 - 8)(82 - 8)(92 - 8).
Page of Squares : First Upload February 13, 2007 ; Last Revised February 13, 2007by Yoshio Mimura, Kobe, Japan
1689
16892 = 2852721, 2 * 852 - 7 * 2 - 1 = 1689.
Page of Squares : First Upload February 13, 2007 ; Last Revised February 13, 2007by Yoshio Mimura, Kobe, Japan
1690
16902 = (1)(2 + 3 + 4 + 5 + 6)(7 + 8 + 9 + ... + 19)(20 + 21 + 22 + ... + 45).
16902= 36 x 37 + 37 x 38 + 38 x 39 + 39 x 40 + 40 x 41 + ... + 204 x 205.
16902 = (22 + 1)(32 + 1)(2392 + 1) = (72 + 1)(2392 + 1) = (32 + 4)(162 + 4)(292 + 4)
= (22 + 9)(112 + 9)(412 + 9).
1010k + 1690k + 2570k + 2830k are squares for k = 1,2,3 (902, 43002, 2133002).
Komachi equation: 16902 = 12 * 2342 * 52 / 62 * 782 / 92.
Page of Squares : First Upload February 13, 2007 ; Last Revised December 14, 2013by Yoshio Mimura, Kobe, Japan
1691
16912 = 2859481, a zigzag square.
Page of Squares : First Upload February 13, 2007 ; Last Revised February 13, 2007by Yoshio Mimura, Kobe, Japan
1692
16922 = 2862864, a square with even digits.
16922 = 2862864, 2 * 862 - 8 - 6 * 4 = 28 * 62 - 8 * 6 + 4 = 1692.
34k + 82k + 98k + 110k are squares for k = 1,2,3 (182, 1722, 16922).
146k + 154k + 654k + 1546k are squares for k = 1,2,3 (502, 16922, 631002).
Komachi equation: 16922 = 9872 * 62 * 52 * 42 * 32 / 2102.
Page of Squares : First Upload February 13, 2007 ; Last Revised April 28, 2011by Yoshio Mimura, Kobe, Japan
1694
16942 = (1)(2 + 3 + 4 + 5)(6 + 7 + 8 + ... + 16)(17 + 18 + 19 + ... + 60).
Page of Squares : First Upload February 13, 2007 ; Last Revised February 13, 2007by Yoshio Mimura, Kobe, Japan
1698
436386k + 524682k + 660522k + 1261614k are squares for k = 1,2,3 (16982, 15791402, 15886454042).
Page of Squares : First Upload April 28, 2011 ; Last Revised April 28, 2011by Yoshio Mimura, Kobe, Japan