OFFSET
1,1
COMMENTS
All terms are primes. Corresponding primes of the form (2^n + 11^n)/13 are {103, 12391, 38880540653801911, ...}.
a(11) > 10^5. - Robert Price, Feb 26 2013
MATHEMATICA
Do[p=Prime[n]; f=(2^p+11^p)/13; If[PrimeQ[f], Print[{p, f}]], {n, 1, 100}]
PROG
(PARI) is(n)=ispseudoprime((2^n+11^n)/13) \\ Charles R Greathouse IV, Feb 20 2017
CROSSREFS
KEYWORD
hard,more,nonn
AUTHOR
Alexander Adamchuk, Feb 06 2007
EXTENSIONS
2 more terms from Ryan Propper, Feb 09 2008
a(9)-a(10) from Robert Price, Feb 26 2013
STATUS
approved