OFFSET
1,3
COMMENTS
No further terms < 100000. - Ray Chandler, Aug 05 2011
a(23) > 2*10^5. - Robert Price, Jun 23 2015
LINKS
Henri & Renaud Lifchitz, PRP Records.
MATHEMATICA
Do[ f = 15^n + 2; If[ PrimeQ[ f ], Print[ {n, f} ] ], {n, 1, 371} ]
PROG
(PARI) is(n)=ispseudoprime(15^n+2) \\ Charles R Greathouse IV, Feb 17 2017
KEYWORD
nonn,more
AUTHOR
Alexander Adamchuk, Mar 02 2008
EXTENSIONS
a(16)-a(19) from Ray Chandler, Jul 30 2011
a(20) found by Lelio R Paula, Dec 2006
a(21) from Ray Chandler, Jul 31 2011
a(22) from Robert Price, Jun 23 2015
STATUS
approved