OFFSET
1,1
COMMENTS
Each prime of the form 4k+1 has a unique representation as x^2+y^2; these primes have y-x=3.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Table[2*n^2+6*n+9, {n, 0, 300}], PrimeQ] (* Vincenzo Librandi, Jul 15 2012 *)
PROG
(Magma) [a: n in [0..200] | IsPrime(a) where a is 2*n^2+6*n+9]; // Vincenzo Librandi, Jul 15 2012
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Cino Hilliard, Oct 28 2002
EXTENSIONS
Edited by Don Reble, May 03 2006
STATUS
approved