OFFSET
0,1
LINKS
Max Alekseyev, Table of n, a(n) for n = 0..420
EXAMPLE
a(3)=256 because 6^3+1 has divisors {1, 7, 31, 217}.
MAPLE
a:=n->numtheory[sigma](6^n+1):
seq(a(n), n=0..100);
MATHEMATICA
DivisorSigma[1, 6^Range[0, 30] + 1] (* Paolo Xausa, Jul 03 2024 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Sean A. Irvine, Oct 14 2023
STATUS
approved