OFFSET
0,1
LINKS
Max Alekseyev, Table of n, a(n) for n = 0..331
EXAMPLE
a(3)=1344 because 10^3+1 has divisors {1, 7, 11, 13, 77, 91, 143, 1001}.
MAPLE
a:=n->numtheory[sigma](10^n+1):
seq(a(n), n=0..100);
MATHEMATICA
DivisorSigma[1, 10^Range[0, 19] + 1] (* Paul F. Marrero Romero, Nov 12 2023 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Sean A. Irvine, Oct 15 2023
STATUS
approved