1,2

Corresponding values of such primes are in A056899(n) for n>2.

Supersequence of A126960 (primes p such that (3p)^2 + 2 is prime).

Jaroslav Krizek, Table of n, a(n) for n = 1..1000

a(n) = sqrt(A056899(n+2) - 2)/3 = A067201(n+2)/3.

7 is in sequence because (3*7)^2 + 2 = 443 (prime).

Select[Range[279], PrimeQ[9 #^2 + 2] &] (* T. D. Noe, Nov 27 2013 *)

(PARI) is(n)=isprime(9*n^2+2) \\ Charles R Greathouse IV, Nov 25 2013

Cf. A000040, A056899, A067201, A126960.

Sequence in context: A316625 A091892 A292939 * A153183 A247648 A117203

Adjacent sequences: A232008 A232009 A232010 * A232012 A232013 A232014

nonn

Jaroslav Krizek, Nov 25 2013

approved