OFFSET
1,1
EXAMPLE
a(4)=53 because 5=1^2+4,13=3^2+4, 29=5^2+4, 53=7^2+4 are prime and 53 is the 4th such prime.
MATHEMATICA
Table[Select[Range[0, 1000]^2+n, PrimeQ][[n]], {n, 40}] (* Harvey P. Dale, Aug 30 2016 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
John L. Drost, Apr 28 2007
STATUS
approved