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 A369003 #18 Nov 11 2024 12:04:11 %S A369003 2,3,4,5,6,7,8,10,11,13,14,17,18,19,22,23,24,26,27,29,30,31,32,34,36, %T A369003 37,38,40,41,42,43,45,46,47,48,50,53,54,56,58,59,60,61,62,63,64,66,67, %U A369003 70,71,72,73,74,75,78,79,80,82,83,84,86,88,89,90,94,96,97,98,99,100,101,102,103,104,105,106,107,109 %N A369003 Numbers k for which k' / gcd(k,k') is odd, where k' stands for the arithmetic derivative of k, A003415. %C A369003 Numbers k such that A276085(k) is not a multiple of four. - _Antti Karttunen_, Nov 11 2024 %H A369003 Antti Karttunen, <a href="/A369003/b369003.txt">Table of n, a(n) for n = 1..10000</a> %o A369003 (PARI) isA369003(n) = !A369001(n); \\ See the code in A369001. %Y A369003 Positions of odd terms in A083345, A373377 and in A373485. Positions of 0's in A369001. %Y A369003 Cf. A003415, A276085, A369002 (complement), A377874 (characteristic function). %Y A369003 Subsequences: A369007, (A377869 U A377875). %Y A369003 Cf. also A368999. %K A369003 nonn %O A369003 1,1 %A A369003 _Antti Karttunen_, Jan 14 2024