cp's OEIS Frontend

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.

A067349 Number of divisors of sigma(n)+phi(n).

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%I A067349 #11 Aug 13 2019 11:23:35
%S A067349 2,3,4,3,4,4,4,2,2,4,4,6,4,8,6,4,4,6,4,6,6,4,4,6,4,8,4,6,4,10,4,2,6,8,
%T A067349 12,2,4,8,10,4,4,12,4,8,8,4,4,12,6,2,8,4,4,8,10,15,6,4,4,8,4,12,12,4,
%U A067349 12,6,4,4,12,16,4,4,4,12,6,10,12,14,4,4,6,4,4,8,6,8,10,12,4,8,8,6,6,8
%N A067349 Number of divisors of sigma(n)+phi(n).
%H A067349 Amiram Eldar, <a href="/A067349/b067349.txt">Table of n, a(n) for n = 1..10000</a>
%F A067349 a(n) = A000005(A000010(n) + A000203(n)).
%t A067349 Table[ DivisorSigma[ 0, DivisorSigma[ 1, w ]+EulerPhi[ w ] ], {w, 1, 128} ]
%o A067349 (PARI) a(n) = numdiv(sigma(n)+eulerphi(n)); \\ _Michel Marcus_, Aug 13 2019
%Y A067349 Cf. A000005, A000010, A000203, A011774, A067350, A067351.
%K A067349 nonn
%O A067349 1,1
%A A067349 _Labos Elemer_, Jan 17 2002