OFFSET
1,1
EXAMPLE
a(6) is 727 because 6*1^2+1=7, 6*4^2+1=97, 6*5^2+1=151, 6*9^2+1=487, 6*10^2+1=601 and 6*11^2+1=727 are the first 6 primes of the form 6x^2+1.
CROSSREFS
KEYWORD
nonn
AUTHOR
John L. Drost, Apr 28 2007
STATUS
approved