OFFSET
1,3
COMMENTS
a(6) > 10^5. - Robert Price, Jan 16 2013
MATHEMATICA
Select[Range[0, 5000], PrimeQ[11^# + #^11 + 1] &]
PROG
(PARI) is(n)=isprime(11^n+n^11+1) \\ Charles R Greathouse IV, Feb 17 2017
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Vincenzo Librandi, Sep 06 2012
EXTENSIONS
a(5) from Robert Price, Jan 16 2014
STATUS
approved