1,1

Prime terms in A121259 = numbers n such that (3n^2+1)/4 is prime.

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Select[Prime[Range[200]], PrimeQ[(3#^2+1)/4]&] (* Harvey P. Dale, Apr 25 2017 *)

Cf. A121259.

Sequence in context: A164642 A247633 A277717 * A127459 A174635 A075579

Adjacent sequences: A120457 A120458 A120459 * A120461 A120462 A120463

base,nonn

Zak Seidov, Aug 25 2006

approved