OFFSET
1,3
COMMENTS
Analogous to A046029 Numbers k such that (k!)^2 + 1 is prime.
a(14) > 10^4. - Robert Price, Aug 06 2014
EXAMPLE
a(7) = 14 because (14!)^3+(14!)^2+1 = 662559760556747835222526525440001 is prime.
MATHEMATICA
Select[Range[200], PrimeQ[#!^3 + #!^2 + 1] &]
PROG
(Magma) [n: n in [0..160]|IsPrime((Factorial(n)^3)+(Factorial(n)^2)+1)]; // Vincenzo Librandi, Dec 22 2010
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Jonathan Vos Post, Oct 05 2006
EXTENSIONS
a(8)-a(11) from Vincenzo Librandi, Dec 22 2010
a(13) from Robert Price, Aug 06 2014
STATUS
approved