A105772 Numbers k such that 7*k + 2 is prime.

0, 3, 5, 11, 15, 21, 23, 27, 33, 45, 47, 51, 53, 57, 63, 65, 71, 77, 81, 93, 101, 107, 117, 123, 125, 131, 135, 147, 155, 161, 167, 173, 183, 185, 195, 197, 201, 203, 207, 213, 221, 231, 251, 255, 257, 267, 273, 285, 287, 291, 293, 297, 305, 311, 315, 317, 333

Offset: 1

Author

Parthasarathy Nambi, May 04 2005

Keywords

• nonn

Examples

			If k=0, then 7*k + 2 = 2 (prime).
If k=63, then 7*63 + 2 = 443 (prime).
		

Links

• Michael De Vlieger, Table of n, a(n) for n = 1..10000

Programs

Magma

[n: n in [0..500]| IsPrime(7*n + 2)]; // Vincenzo Librandi, Feb 03 2011

Mathematica

Select[Range[0,500],PrimeQ[7#+2]&]  (* Harvey P. Dale, Apr 21 2011 *)

PARI

is(n)=isprime((7*n+2)) \\ Charles R Greathouse IV, Feb 17 2017

Extensions

More terms from Rick L. Shepherd, May 18 2005