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 A091819 #8 Mar 06 2022 23:09:01 %S A091819 79,91,157,158,159,182,183,187,279,287,314,316,317,318,319,351,364, %T A091819 365,366,374,375,379,445,558,573,574,575,628,632,634,636,637,638,639, %U A091819 702,703,728,730,732,735,748,750,751,758,759,763,815,890,893,975,1071 %N A091819 Numbers k that have, in binary, the same number of ones as are in k^2 and which have no nonincreasing binary representation. %C A091819 In A077436 but not in A023758. %H A091819 G. Melfi, <a href="https://arxiv.org/abs/math/0402458">On simultaneous binary expansions of n and n^2</a>, arXiv:math/0402458 [math.NT], 2004. %K A091819 nonn %O A091819 1,1 %A A091819 _Ralf Stephan_, Mar 08 2004