OFFSET
1,1
LINKS
Charles R Greathouse IV, Table of n, a(n) for n = 1..21
PROG
(Magma) [3*6^n-1: n in [0..140] | IsPrime(3*6^n-1)]; // Bruno Berselli, Feb 12 2011
(PARI) v=[]; for(n=0, 1e3, if(ispseudoprime(k=3*6^n-1), v=concat(v, k))); v \\ Charles R Greathouse IV, Jul 26 2011
CROSSREFS
KEYWORD
nonn
AUTHOR
Gilbert Mozzo, Feb 12 2011
EXTENSIONS
Edited by N. J. A. Sloane, Feb 12 2011
STATUS
approved