OFFSET
1,2
FORMULA
If p is prime, a(p) = 1 + p.
MATHEMATICA
a[n_] := DivisorSum[n, Binomial[n, #]^# &]; Array[a, 20] (* Amiram Eldar, Oct 08 2021 *)
PROG
(PARI) a(n) = sumdiv(n, d, binomial(n, d)^d);
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Oct 08 2021
STATUS
approved