OFFSET
1
LINKS
FORMULA
PROG
(PARI)
A156552(n) = { my(f = factor(n), p, p2 = 1, res = 0); for(i = 1, #f~, p = 1 << (primepi(f[i, 1]) - 1); res += (p * p2 * (2^(f[i, 2]) - 1)); p2 <<= f[i, 2]); res };
memoA353418 = Map();
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jan 17 2023
STATUS
approved