A107303 Numbers k such that (3*k - 5) is prime.

4, 6, 8, 12, 14, 16, 22, 24, 26, 28, 34, 36, 38, 44, 48, 52, 54, 56, 62, 66, 68, 72, 76, 78, 82, 92, 94, 96, 104, 106, 112, 114, 118, 124, 126, 128, 134, 138, 142, 146, 148, 154, 156, 164, 168, 176, 182, 184, 192, 194, 202, 204, 206, 208, 212, 216, 222, 226, 232

Offset: 1

Author

Parthasarathy Nambi, May 20 2005

Keywords

• nonn
• easy

Comments

3 and 5 are twin primes.

Examples

			If k=4, then 3*k - 5 = 7 (prime).
If k=28, then 3*k - 5 = 79 (prime).
		

Links

• Daniel Starodubtsev, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A088879.

Cf. A153183, A024892, A034936.

Equals A153183(n) + 1; also A024892(n) + 2; also A034936(n) + 3;

Programs

Magma

[n: n in [2..300] | IsPrime(3*n-5)]; // Vincenzo Librandi, Nov 13 2010

Mathematica

Select[Range[2,250],PrimeQ[3#-5]&] (* Harvey P. Dale, Mar 31 2024 *)

PARI

is(n)=isprime((3*n-5)) \\ Charles R Greathouse IV, Jun 12 2017