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 A369976 #8 Feb 09 2024 15:49:34 %S A369976 1,9,12,15,16,20,21,25,28,33,35,39,44,49,51,52,55,57,65,68,69,76,77, %T A369976 85,87,91,92,93,95,108,111,115,116,119,121,123,124,129,133,135,141, %U A369976 143,145,148,155,159,161,164,169,172,177,180,183,185,187,188,189,192,201,203,205,209,212,213,215,217,219,221,235 %N A369976 Numbers k for which A369974(k) is odd. %C A369976 Because A369002 is a multiplicative semigroup this is its subsequence. Proof is similar to one given in A359780. %H A369976 Antti Karttunen, <a href="/A369976/b369976.txt">Table of n, a(n) for n = 1..21017</a> %o A369976 (PARI) \\ See A369975. %Y A369976 Cf. A083345, A369001, A369975 (characteristic function). %Y A369976 Positions of odd terms in A369974 and in A369978. %Y A369976 Subsequence of A369002. %Y A369976 Cf. also A359780. %K A369976 nonn %O A369976 1,2 %A A369976 _Antti Karttunen_, Feb 09 2024