OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
EXAMPLE
If n=312 then 5*n^2 + 1 = 486721 (prime).
MATHEMATICA
Select[Range[1000], PrimeQ[5*#^2 + 1] &] (* Stefan Steinerberger, Feb 26 2006 *)
PROG
(PARI) is(n)=isprime(5*n^2+1) \\ Charles R Greathouse IV, Jun 12 2017
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Parthasarathy Nambi, Oct 18 2005
EXTENSIONS
More terms from Stefan Steinerberger, Feb 26 2006
STATUS
approved