This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A256000 #24 Apr 21 2024 11:38:52 %S A256000 286,826,2739,3971,5698,9196,10166,10697,22990,61006,132795,416790, %T A256000 766480,809380,2396870,2904434,3459006,3688802,4518514,11725659, %U A256000 13111098,13998608,15709122,22173027,22365267,23636272,23823988,32186742,33630662,33658710,39502086,46387924,59101625,62381858,89841192 %N A256000 Numbers whose square can be written as sum of at least 3 consecutive triangular numbers in two ways. %C A256000 Apparently there is an infinity of such numbers and there are no cases of 3 ways. %e A256000 4518514^2 = T(18801)+..+T(50546) = T(52361)+..+T(64316), where T(n) = A000217(n). %Y A256000 Cf. A000217 (triangular numbers), A257274. %K A256000 nonn %O A256000 1,1 %A A256000 _Zak Seidov_, May 06 2015 %E A256000 a(10), a(20)-a(35) from _Chai Wah Wu_, Jan 21 2016