OFFSET
1,1
COMMENTS
If q = 2*n + 1 is prime, and n is even, q divides (n!)^2 + 1. - Arkadiusz Wesolowski, Sep 06 2012
LINKS
T. D. Noe, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Range[2, 300, 2], PrimeQ[2*# + 1] &]
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Zak Seidov, Mar 18 2005
EXTENSIONS
a(48)-a(57) from Arkadiusz Wesolowski, Sep 06 2012
STATUS
approved