OFFSET
1,2
COMMENTS
a(8) > 2*10^5. - Robert Price, Nov 08 2014
MATHEMATICA
Select[Range[0, 5000], PrimeQ[11^# + #^11 - 1] &]
PROG
(Magma) [n: n in [0..2000] | IsPrime(11^n + n^11 - 1)]
(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(7) from Robert Price, Mar 15 2014
STATUS
approved