OFFSET
1,2
FORMULA
a(n) = Sum_{d|n} A054432(d).
MATHEMATICA
Table[Sum[2^(k/GCD[n, k] - 1), {k, 1, n}], {n, 1, 36}]
PROG
(PARI) a(n) = sum(k=1, n, 2^(k/gcd(n, k) - 1)); \\ Michel Marcus, Apr 22 2021
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Apr 22 2021
STATUS
approved