login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A034773 Dirichlet convolution of d(n) (number of divisors of n) with primes (with 1). 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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..57.

PROG

(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

CROSSREFS

Cf. A000005, A008578.

Sequence in context: A191161 A246316 A344372 * A323766 A330223 A325688

Adjacent sequences:  A034770 A034771 A034772 * A034774 A034775 A034776

KEYWORD

nonn

AUTHOR

Erich Friedman

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 23 02:41 EDT 2021. Contains 347609 sequences. (Running on oeis4.)