OFFSET
1,1
EXAMPLE
a(1)=3 because 1^2+1+1=3 is prime, a(3)=11 because 1^2+1+9=11 is prime.
MATHEMATICA
Union[Select[Flatten[Table[n^2+n+{1, 9}, {n, 200}]], PrimeQ]] (* Harvey P. Dale, Aug 28 2012 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Feb 15 2010
EXTENSIONS
Added 3, removed 133, replaced 607 by 601 - R. J. Mathar, Feb 24 2010
STATUS
approved