OFFSET
1,2
COMMENTS
a(17) > 150000. - Giovanni Resta, Mar 19 2014
a(19) > 3*10^5. - Robert Price, Apr 30 2014
MATHEMATICA
Select[Range[0, 9000], PrimeQ[2^# + #^2 - 1] &]
PROG
(Magma) [n: n in [0..1000] | IsPrime(2^n+n^2-1)]
(PARI) is(n)=ispseudoprime(2^n+n^2-1) \\ Charles R Greathouse IV, May 22 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Sep 03 2012
EXTENSIONS
a(13)-a(16) from Giovanni Resta, Mar 19 2014
a(17)-a(18) from Robert Price, Apr 30 2014
STATUS
approved