OFFSET
1,2
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..630 (calculated using Jon E. Schoenfield's a-file at A000129)
EXAMPLE
a(9)=1188 because Pell(9)=985 has divisors {1, 5, 197, 985}.
MATHEMATICA
DivisorSigma[1, LinearRecurrence[{2, 1}, {1, 2}, 32]] (* Amiram Eldar, Oct 19 2023 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Tyler Busby, Oct 19 2023
STATUS
approved