login
A376431
a(n) is the least odd prime factor of prime(n)^prime(n)-1.
2
3, 13, 11, 3, 5, 3, 10949, 3, 11, 7, 3, 3, 5, 3, 23, 13, 29, 3, 3, 5, 3, 3, 41, 11, 3, 5, 3, 53, 3, 7, 3, 5, 17, 3, 37, 3, 3, 3, 83, 43, 89, 3, 5, 3, 7, 3, 3, 3, 113, 3, 29, 7, 3, 5, 21589, 131, 67, 3, 3, 5, 3, 73, 3, 5, 3, 79, 3, 3, 173, 3, 11, 179, 3, 3, 3, 191
OFFSET
1,1
LINKS
FORMULA
a(n) = A078701(A088730(n)). - Michel Marcus, Sep 27 2024
PROG
(PARI) a376431(n) = my(pp=prime(n)^prime(n)-1); forprime (p=3, oo, if(pp%p==0, return(p)))
CROSSREFS
KEYWORD
nonn
AUTHOR
Hugo Pfoertner, Sep 27 2024
STATUS
approved