A107994 Numbers n such that 11*n - 2 is prime.

3, 5, 9, 15, 21, 23, 29, 35, 41, 59, 63, 69, 75, 83, 89, 93, 99, 101, 105, 119, 125, 131, 135, 141, 143, 149, 159, 171, 173, 183, 191, 195, 209, 213, 225, 231, 243, 245, 255, 269, 273, 275, 279, 281, 293, 303, 315, 321, 329, 339, 345, 353, 359, 365, 369, 371

Offset: 1

Author

Parthasarathy Nambi, Jun 14 2005

Keywords

• nonn
• easy

Examples

			If n=3, then 11*n - 2 = 31 (prime).
If n=59, then 11*n - 2 = 647 (prime).
		

Links

• Robert Israel, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A141856.

Programs

Magma

[n: n in [1..100000] | IsPrime(11*n-2)] // Vincenzo Librandi, Nov 13 2010

Maple

select(t -> isprime(11*t-2), [seq(i,i=1..1000,2)]); # Robert Israel, Oct 04 2019

Mathematica

Select[Range[500],PrimeQ[11#-2]&]  (* Harvey P. Dale, Mar 11 2011 *)

PARI

is(n)=isprime(11*n-2) \\ Charles R Greathouse IV, Jun 13 2017

Formula

a(n) = (A141856(n)+2)/11. - Robert Israel, Oct 04 2019