OFFSET
1,1
LINKS
Max Alekseyev, Table of n, a(n) for n = 1..316
EXAMPLE
a(3)=16 because 11^3-1 has divisors {1, 2, 5, 7, 10, 14, 19, 35, 38, 70, 95, 133, 190, 266, 665, 1330}.
MAPLE
a:=n->numtheory[tau](11^n-1):
seq(a(n), n=1..100);
MATHEMATICA
DivisorSigma[0, 11^Range[100]-1]
PROG
(PARI) a(n) = numdiv(11^n-1);
CROSSREFS
KEYWORD
nonn
AUTHOR
Sean A. Irvine, Oct 16 2023
STATUS
approved