A244087 Numbers n such that 4*n+3 and 8*n+7 are prime.

0, 2, 5, 20, 32, 44, 47, 59, 62, 89, 104, 107, 110, 122, 164, 170, 179, 185, 227, 254, 257, 275, 305, 359, 362, 374, 377, 389, 395, 452, 482, 500, 509, 515, 584, 587, 599, 614, 635, 674, 704, 725, 734, 740, 755, 824, 839, 872, 884, 905, 944, 950, 962, 965, 977

Offset: 1

Author

Vincenzo Librandi, Jun 25 2014

Keywords

• nonn
• easy

Comments

-2 is a primitive root mod (8*n+7).

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Crossrefs

Intersection of A095278 and A139487.

Programs

Magma

[n: n in [0..1000] | IsPrime(4*n+3) and IsPrime(8*n+7)];

Mathematica

Select[Range[0, 1500], PrimeQ[4 # + 3]&&PrimeQ[8 # + 7] &]