A034773 Dirichlet convolution of d(n) (number of divisors of n) with primes (with 1).

1, 4, 5, 12, 9, 25, 15, 37, 28, 45, 31, 86, 39, 75, 67, 109, 55, 143, 63, 158, 107, 139, 81, 264, 106, 179, 152, 248, 109, 319, 115, 308, 199, 251, 183, 484, 153, 287, 247, 472, 175, 505, 183, 448, 356, 363, 201, 747, 252, 491, 345, 562, 241, 704, 327, 712, 395

Offset: 1

Author

Erich Friedman

Keywords

• nonn

Crossrefs

Cf. A000005, A008578.

Programs

PARI

pbc(n) = if (n==1, 1, prime(n-1));
a(n) = sumdiv(n, d, numdiv(d)*pbc(n/d)); \\ Michel Marcus, Feb 28 2019