A139402 Prime numbers k such that 8*k+1 and 8*k+3 are also primes.

2, 5, 17, 71, 101, 107, 131, 491, 677, 761, 821, 1307, 1361, 1367, 1667, 2081, 2207, 2837, 3461, 3467, 3761, 3767, 4007, 5087, 5147, 5231, 5381, 5927, 6701, 6737, 6917, 6977, 8447, 8741, 8807, 9011, 9341, 9677, 9767

Offset: 1

Author

Artur Jasinski, Apr 19 2008

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A125822.

Programs

Mathematica

a = {}; Do[If[PrimeQ[8 n + 1] && PrimeQ[8 n + 3] && PrimeQ[n],AppendTo[a, n]], {n, 1, 10000}]; a