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 A174147 #6 Jun 02 2025 02:43:37
%S A174147 0,2,4,2,8,5,12,2,4,9,20,5,24,13,14,2,32,5,36,9,20,21,44,5,8,25,4,13,
%T A174147 56,15,60,2,32,33,34,5,72,37,38,9,80,21,84,21,14,45,92,5,12,9,50,25,
%U A174147 104,5,54,13,56,57,116,15,120,61,20,2,64,33,132,33,68,35,140,5,144,73,14
%N A174147 a(n) = n-th sum{p-1|p is prime and divisor of n} plus n-th product{p-1|p is prime and divisor of n}.
%C A174147 for n=1 sum{p-1|p is prime and divisor of 1} is zero.
%F A174147 a(n)=A055631(n)+A173557(n).
%Y A174147 Cf. A055631, A173557.
%K A174147 nonn
%O A174147 1,2
%A A174147 _Juri-Stepan Gerasimov_, Mar 09 2010
%E A174147 Formula index corrected, a 62 replaced by 64 - _R. J. Mathar_, Apr 25 2010.