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 A359783 #9 Jan 14 2023 12:40:10
%S A359783 1,4,8,9,12,15,20,21,24,25,28,32,33,35,36,39,40,44,48,49,51,52,55,56,
%T A359783 57,60,64,65,68,69,72,76,77,80,84,85,87,88,91,92,93,95,96,100,104,108,
%U A359783 111,112,115,116,119,120,121,123,124,129,132,133,135,136,140,141,143,144,145,148,152,155,156,159,160,161
%N A359783 Positions of odd terms in A359780.
%o A359783 (PARI) isA359783(n) = A359781(n);
%Y A359783 Positions of odd terms in A359780 and in A359790.
%Y A359783 Cf. A003415, A056913 (subsequence), A358680, A359780, A359781 (characteristic function), A359782 (complement).
%Y A359783 Setwise difference A235992\{0} \ A359784.
%Y A359783 Cf. also A359765, A359825.
%K A359783 nonn
%O A359783 1,2
%A A359783 _Antti Karttunen_, Jan 13 2023