OFFSET
1,4
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..630 (calculated using Jon E. Schoenfield's a-file at A000129)
EXAMPLE
a(8)=5 because Pell(8)=408 has prime factors {2, 2, 2, 3, 17}.
MATHEMATICA
PrimeOmega[LinearRecurrence[{2, 1}, {1, 2}, 83]] (* Stefano Spezia, Oct 19 2023 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Tyler Busby, Oct 19 2023
STATUS
approved