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 A366202 #12 Nov 17 2024 12:15:47 %S A366202 21,23,25,39,42,43,45,47,49,51,55,58,73,75,78,79,83,85,86,87,91,93,95, %T A366202 97,99,101,103,106,107,109,110,111,113,115,117,122,140,141,142,143, %U A366202 149,150,151,153,154,155,158,159,162,163,166,167,169,170,171,172,175 %N A366202 Numbers x such that (x^2 AND x) is not a square, where AND is the bitwise logical-and operation. %C A366202 Numbers x such that A213541(x) is not in A000290. %H A366202 Harvey P. Dale, <a href="/A366202/b366202.txt">Table of n, a(n) for n = 1..1000</a> %t A366202 Select[Range[200],!IntegerQ[Sqrt[BitAnd[#^2,#]]]&] (* _Harvey P. Dale_, Nov 17 2024 *) %Y A366202 Cf. A000290, A213541. %K A366202 nonn,base %O A366202 1,1 %A A366202 _Alex Ratushnyak_, Oct 04 2023