A175284 Primes p of the form p=n^2+3n+9 such that q=p^2+3p+9 is also prime.

7, 37, 163, 709, 877, 46447, 67867, 81517, 118687, 238639, 292147, 331207, 430999, 497737, 548347, 628063, 1120429, 1412539, 1462897, 1655089, 1680919, 1955809, 2642257, 3205897, 3358063, 3394813, 3781087, 4654813, 4715419, 4745869

Offset: 1

Author

Zak Seidov, Mar 21 2010

Keywords

• nonn

Comments

Intersection of A175283 and A005471.

Crossrefs

Cf. A005471, A175281-3.

Programs

Mathematica

Reap[Do[If[PrimeQ[p=n^2+3n+9]&&PrimeQ[q=p^2+3p+9],Sow[p]],{n,-1,10^4}]][[2,1]]