OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..300 (terms 1..101 from Robert G. Wilson v)
Eric Weisstein's World of Mathematics, Fermat Pseudoprime.
MATHEMATICA
Do[ f=PowerMod[ 13, 2n-1, 2n ]; If[ f==1, Print[ 2n ] ], {n, 2, 1000000} ] (* Robert G. Wilson v, May 31 2007 *)
PROG
(PARI) is(k) = k > 2 && !(k % 2) && Mod(13, k)^(k-1) == 1; \\ Amiram Eldar, Sep 18 2024
CROSSREFS
KEYWORD
nonn
AUTHOR
Alexander Adamchuk, May 26 2007
EXTENSIONS
a(26)-a(31) from Robert G. Wilson v, May 31 2007
STATUS
approved