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 A297170 #5 Mar 03 2018 17:34:39 %S A297170 1,1,1,1,1,2,1,1,2,4,1,4,1,2,1,1,1,3,1,2,1,2,1,4,2,4,1,4,1,2,1,1,5,4, %T A297170 1,1,1,2,1,2,1,6,1,20,3,2,1,4,2,1,1,2,1,6,1,8,1,4,1,4,1,2,1,1,1,2,1,2, %U A297170 1,2,1,3,1,4,1,4,1,6,1,2,2,4,1,4,1,2,1,4,1,24,3,4,5,2,1,4,1,1,3,1,1,2,1,2,3 %N A297170 a(n) = gcd(phi(n), sigma(n)-n). %H A297170 Antti Karttunen, <a href="/A297170/b297170.txt">Table of n, a(n) for n = 1..65537</a> %F A297170 a(n) = gcd(A000010(n), A001065(n)). %o A297170 (PARI) A297170(n) = gcd(eulerphi(n),sigma(n)-n); %Y A297170 Cf. A000010, A000203, A001065, A009223. %K A297170 nonn %O A297170 1,6 %A A297170 _Antti Karttunen_, Mar 03 2018