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

1,1

Comments

3 and 5 are twin primes.

Links

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

Example

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

Mathematica

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

Prog

(Magma) [n: n in [2..300] | IsPrime(3*n-5)]; // Vincenzo Librandi, Nov 13 2010
(PARI) is(n)=isprime((3*n-5)) \\ Charles R Greathouse IV, Jun 12 2017

Crossrefs

Cf. A088879.

Cf. A153183, A024892, A034936.

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

Sequence in context: A359675 A225508 A235036 * A028876 A271346 A053579

Adjacent sequences: A107300 A107301 A107302 * A107304 A107305 A107306

Keyword

nonn,easy

Author

Parthasarathy Nambi, May 20 2005

Status

approved