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 A374049 #9 Jun 28 2024 09:09:28 %S A374049 0,1,2,4,6,7,8,9,10,12,14,15,16,17,18,20,22,24,25,26,28,29,30,32,33, %T A374049 34,36,38,39,40,41,42,44,46,48,49,50,52,53,54,55,56,57,58,60,62,63,64, %U A374049 65,66,67,68,69,70,72,74,76,78,79,80,81,82,84,86,88,90,92,93,94,95,96,97,98,100,102,104,105,106,107,108 %N A374049 Numbers k for which A328846(k) is even, where A328846 is the second Fibonacci based variant of arithmetic derivative. %C A374049 A multiplicative semigroup: if m and n are in the sequence, then so is m*n. %H A374049 Antti Karttunen, <a href="/A374049/b374049.txt">Table of n, a(n) for n = 1..12000</a> %H A374049 <a href="/index/Pri#prime_indices">Index entries for sequences related to prime indices in the factorization of n</a> %o A374049 (PARI) isA374049 = A374048; %Y A374049 Cf. A328846, A374048 (characteristic function), A374050 (complement). %Y A374049 Cf. also A374046. %K A374049 nonn %O A374049 1,3 %A A374049 _Antti Karttunen_, Jun 28 2024