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A034762 Dirichlet convolution of primes (with 1) with sigma(n). 1

%I #8 Mar 01 2019 08:06:59

%S 1,5,7,18,13,40,21,61,44,74,41,157,51,120,113,194,71,261,81,293,179,

%T 220,103,542,162,278,256,461,137,654,145,587,331,386,321,1033,189,440,

%U 409,1000,215,1032,225,829,720,554,247,1711,384,913,567,1035,293,1468

%N Dirichlet convolution of primes (with 1) with sigma(n).

%o (PARI) pbc(n) = if (n==1, 1, prime(n-1));

%o a(n) = sumdiv(n, d, pbc(d)*sigma(n/d)); \\ _Michel Marcus_, Feb 28 2019

%Y Cf. A000203, A008578.

%K nonn

%O 1,2

%A _Erich Friedman_

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Last modified April 12 07:22 EDT 2024. Contains 371623 sequences. (Running on oeis4.)