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 A295312 #8 Nov 23 2017 12:28:27 %S A295312 1,1,2,3,2,2,4,1,4,3,4,1,6,4,8,15,6,4,8,3,16,6,8,2,6,6,16,6,8,4,16,9, %T A295312 16,9,16,2,18,8,8,3,12,16,20,6,8,12,16,5,36,6,8,21,18,16,24,4,32,12, %U A295312 16,4,30,16,16,63,24,8,32,9,32,24,24,4,36,18,4,12,32,8,32,3,110,18,24,8,36,20,32,6,24,4,48,12,64,24,32,3 %N A295312 a(n) = A062401(n) / A295310(n) = phi(sigma(n)) / gcd(n, phi(sigma(n))). %H A295312 Antti Karttunen, <a href="/A295312/b295312.txt">Table of n, a(n) for n = 1..16384</a> %F A295312 a(n) = A000010(A000203(n)) / gcd(n, A000010(A000203(n))). %o A295312 (PARI) a(n) = my(fsn = eulerphi(sigma(n))); fsn/gcd(n, fsn); \\ _Michel Marcus_, Nov 23 2017 %Y A295312 Cf. A000010, A000203, A062401, A295301, A295310, A295311, A295315. %K A295312 nonn %O A295312 1,3 %A A295312 _Antti Karttunen_, Nov 22 2017