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 A358772 #6 Dec 01 2022 21:08:54 %S A358772 2,3,5,6,7,11,13,14,17,18,19,22,23,29,31,37,38,41,42,43,46,47,50,53, %T A358772 54,59,61,62,66,67,71,73,79,83,86,89,94,97,98,101,103,107,109,113,114, %U A358772 118,126,127,130,131,134,137,138,139,142,149,150,151,154,157,158,162,163,166,167,170,173,179,181 %N A358772 Numbers whose arithmetic derivative is of the form 4k+1, cf. A003415. %o A358772 (PARI) isA358772(n) = A358771(n); %Y A358772 Cf. A000040 (subsequence), A003415, A358771 (characteristic function). %Y A358772 Setwise difference A235991 \ A358774. Cf. also A327862, A327864. %K A358772 nonn %O A358772 1,1 %A A358772 _Antti Karttunen_, Dec 01 2022