A123978 Numbers k for which 8*k+1, 8*k+3 and 8*k+7 are primes.

2, 5, 80, 107, 110, 185, 260, 332, 500, 1067, 1307, 1472, 1625, 1760, 1790, 1955, 2255, 2612, 2627, 2672, 2882, 2945, 3197, 3335, 3467, 3965, 4007, 4037, 4040, 4202, 4355, 4880, 5147, 5252, 5525, 6242, 6812, 6917, 6977, 7430, 7787, 8192, 8612, 8657, 8720

Offset: 1

Author

Artur Jasinski, Oct 30 2006

Keywords

• nonn

Links

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

Crossrefs

Cf. A005122, A005123, A005124.

Programs

Mathematica

Select[Range[10^4], And @@ PrimeQ /@ ({1, 3, 7} + 8#) &] (* Ray Chandler, Nov 05 2006 *)

Extensions

Extended by Ray Chandler, Nov 05 2006