OFFSET
0,1
LINKS
Max Alekseyev, Table of n, a(n) for n = 0..502
FORMULA
a(n) = A046798(3*n). - Max Alekseyev, Jan 09 2024
EXAMPLE
a(4)=4 because 8^4+1 has divisors {1, 17, 241, 4097}.
MAPLE
a:=n->numtheory[tau](8^n+1):
seq(a(n), n=0..100);
MATHEMATICA
DivisorSigma[0, 8^Range[0, 59] + 1] (* Paul F. Marrero Romero, Nov 12 2023 *)
PROG
(PARI) a(n) = numdiv(8^n+1);
CROSSREFS
KEYWORD
nonn
AUTHOR
Sean A. Irvine, Oct 15 2023
STATUS
approved