OFFSET
0,2
LINKS
N. J. A. Sloane, Table of n, a(n) for n = 0..8191
FORMULA
G.f.: (1/(1 - x)) * Product_{k>=0} (1 + prime(k+1)*x^(2^k)). - Ilya Gutkovskiy, Aug 18 2021
PROG
(PARI)
A019565(n) = { my(m=1, p=1); while(n>0, p = nextprime(1+p); if(n%2, m *= p); n >>= 1); (m); };
CROSSREFS
KEYWORD
nonn,look
AUTHOR
N. J. A. Sloane, Jun 26 2017
STATUS
approved