A177336 Greater of twin primes p such that 3*p-2 is also greater of twin primes.

5, 7, 61, 271, 1951, 3001, 6361, 11491, 11551, 14551, 18541, 19891, 21841, 31081, 32911, 32971, 33331, 33601, 42571, 42841, 50461, 53551, 58111, 68881, 70201, 74611, 79231, 80911, 93811, 96331, 98911, 104311, 109141, 114601, 121021, 125791

Offset: 1

Author

Juri-Stepan Gerasimov, May 07 2010

Keywords

• nonn

Examples

			a(1) = 5 because 5 is the greater of the twin primes (3, 5) and 3*5 - 2 = 13 is the greater of the twin primes (11, 13).
		

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A006512, A038869, A088878.

Cf. A132929, A174920.

Programs

Magma

[p:p in PrimesInInterval(3,130000)| IsPrime(p-2) and IsPrime(3*p-2) and IsPrime(3*p-4)]; // Marius A. Burtea, Dec 23 2019

Mathematica

Select[Range[3, 126000], And @@ PrimeQ[{#, # - 2, 3# - 2, 3# - 4}] &] (* Amiram Eldar, Dec 23 2019 *)

Formula

From Wesley Ivan Hurt, May 03 2022: (Start)

a(n) = A132929(n) + 1.

a(n) = A174920(n) + 2. (End)

Extensions

Definition corrected, 1231 and 1483 inserted, and all values above 3000 corrected by R. J. Mathar, May 10 2010

Terms corrected to match definition by D. S. McNeil, May 10 2010

Name corrected by Amiram Eldar, Dec 23 2019