A111249 Numbers n such that 7*n + 8 is prime.

3, 5, 9, 15, 17, 27, 29, 33, 39, 47, 53, 59, 63, 65, 69, 77, 87, 89, 93, 95, 99, 105, 107, 117, 125, 129, 135, 137, 143, 149, 155, 165, 183, 185, 195, 203, 209, 213, 225, 227, 237, 243, 245, 267, 275, 285, 287, 297, 303, 305, 315, 323, 327, 329, 333, 339, 345

Offset: 1

Author

Parthasarathy Nambi, Oct 31 2005

Keywords

• nonn

Comments

One less than the associated entry in A024905.

Examples

			If n=125 then 7*n + 8 = 883 (prime).
		

Crossrefs

Cf. A024900, A024902, A024905, A105772.

Programs

Magma

[n: n in [0..100000] | IsPrime(7*n+8)] // Vincenzo Librandi, Nov 13 2010

Maple

A111249:=n->`if`(isprime(7*n+8), n, NULL): seq(A111249(n), n=1..10^3); # Wesley Ivan Hurt, Feb 13 2017

Mathematica

Select[Range[1,351,2], PrimeQ[7#+8]&] (* Harvey P. Dale, Sep 11 2016 *)

PARI

is(n)=isprime(7*n+8) \\ Charles R Greathouse IV, Feb 14 2017