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 A326046 #12 Dec 15 2024 16:29:22 %S A326046 1,1,1,1,4,2,3,1,1,1,1,4,12,2,1,1,8,1,3,1,5,2,1,4,1,5,1,24,28,6,15,1, %T A326046 1,1,1,1,36,2,1,1,40,2,3,4,4,10,1,4,1,7,15,3,4,2,19,4,1,1,1,8,60,2,1, %U A326046 1,1,6,3,1,1,2,35,1,72,1,1,12,1,2,3,1,1,1,1,4,1,2,1,4,8,27,5,8,29,2,7,60,48,1,1,1,100,6,3,1,1 %N A326046 a(n) = gcd(n-A326039(n), A326040(n)-n). %H A326046 Antti Karttunen, <a href="/A326046/b326046.txt">Table of n, a(n) for n = 1..20000</a> %F A326046 a(n) = gcd(A326044(n), A326045(n)) = gcd(n-A326039(n), A326040(n)-n). %o A326046 (PARI) %o A326046 A008833(n) = (n/core(n)); %o A326046 A326039(n) = A008833(sigma(n)); %o A326046 A326040(n) = (sigma(n)-A008833(sigma(n))); %o A326046 A326046(n) = gcd(n-A326039(n), A326040(n)-n); %Y A326046 Cf. A000203, A008833, A326039, A326040, A326044, A326045. %Y A326046 Cf. also A009194, A325385, A325813, A325975, A326047, A326048, A326056, A326057, A326060, A326062, A326129, A326130, A326140, A326144. %K A326046 nonn %O A326046 1,5 %A A326046 _Antti Karttunen_, Jun 06 2019