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 A034773 #8 Mar 01 2019 08:07:07 %S A034773 1,4,5,12,9,25,15,37,28,45,31,86,39,75,67,109,55,143,63,158,107,139, %T A034773 81,264,106,179,152,248,109,319,115,308,199,251,183,484,153,287,247, %U A034773 472,175,505,183,448,356,363,201,747,252,491,345,562,241,704,327,712,395 %N A034773 Dirichlet convolution of d(n) (number of divisors of n) with primes (with 1). %o A034773 (PARI) pbc(n) = if (n==1, 1, prime(n-1)); %o A034773 a(n) = sumdiv(n, d, numdiv(d)*pbc(n/d)); \\ _Michel Marcus_, Feb 28 2019 %Y A034773 Cf. A000005, A008578. %K A034773 nonn %O A034773 1,2 %A A034773 _Erich Friedman_