A329031 a(n) = A327860(A328841(n)).

0, 1, 1, 5, 1, 5, 1, 7, 8, 31, 8, 31, 1, 7, 8, 31, 8, 31, 1, 7, 8, 31, 8, 31, 1, 7, 8, 31, 8, 31, 1, 9, 10, 41, 10, 41, 12, 59, 71, 247, 71, 247, 12, 59, 71, 247, 71, 247, 12, 59, 71, 247, 71, 247, 12, 59, 71, 247, 71, 247, 1, 9, 10, 41, 10, 41, 12, 59, 71, 247, 71, 247, 12, 59, 71, 247, 71, 247, 12, 59, 71, 247, 71, 247, 12, 59

Offset: 0

Author

Antti Karttunen, Nov 07 2019

Keywords

• nonn

Links

• Antti Karttunen, Table of n, a(n) for n = 0..32768
• Index entries for sequences related to primorial base

Crossrefs

Cf. A003415, A069359, A276086, A327860, A328571, A328841, A329032.

Cf. A060735 (the positions of ones).

Programs

PARI

A329031(n) = { my(s=0, m=1, p=2); while(n, if(n%p, m *= p; s += (1/p)); n = n\p; p = nextprime(1+p)); (s*m); };

Formula

a(n) = A327860(A328841(n)) = A003415(A276086(A328841(n))).

a(n) = A003415(A328571(n)) = A069359(A328571(n)).