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 A151948 #9 Aug 23 2017 06:11:22 %S A151948 1,1,2,2,2,2,6,2,6,2,6,2,6,6,4,4,2,6,4,4,6,6,9,4,8,6,4,6,8,4,12,2,8,2, %T A151948 12,6,4,4,12,2,12,6,12,8,12,9,12,2,12,8,6,12,6,4,12,12,4,8,12,2,16,12, %U A151948 4,6,6,8,15,6,12,12,15,12,8,4,12,4,16,12,16 %N A151948 a(n) = tau(sigma(phi(n))). %H A151948 Antti Karttunen, <a href="/A151948/b151948.txt">Table of n, a(n) for n = 1..10000</a> %F A151948 a(n) = A000005(A000203(A000010(n))) = A000005(A062402(n)) = A062068(A000010(n)). %o A151948 (PARI) A151948(n) = numdiv(sigma(eulerphi(n))); \\ _Antti Karttunen_, Aug 22 2017 %Y A151948 Cf. A000005, A000010, A000203, A062068, A062402, A163375. %K A151948 nonn %O A151948 1,3 %A A151948 _Jaroslav Krizek_, Jul 20 2009