A177335 List of 4-tuples of twin primes q, p, p+2 and q+2 such that 3*q<p<(p+2)<3*(q+2).

3, 11, 13, 5, 5, 17, 19, 7, 59, 179, 181, 61, 269, 809, 811, 271, 1949, 5849, 5851, 1951, 2999, 8999, 9001, 3001, 6359, 19079, 19081, 6361, 11489, 34469, 34471, 11491, 11549, 34649, 34651, 11551, 14549, 43649, 43651, 14551

Offset

1,1

Links

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

Formula

From Robert Israel, May 05 2019: (Start)

a(4k-3) = A174920(k).

a(4k-2) = 3*A174920(k) + 2.

a(4k-1) = 3*A174920(k) + 4.

a(4k) = A174920(k)+2. (End)

Maple

A174920:= select(q -> isprime(q) and isprime(q+2) and isprime(3*q+2) and isprime(3*q+4), [3, seq(i, i=5..200000, 6)]):
map(t -> (t, 3*t+2, 3*t+4, t+2), A174920); # Robert Israel, May 05 2019

Crossrefs

Cf. A174920, A176821.

Sequence in context: A141386 A254220 A119231 * A031449 A305859 A090260

Adjacent sequences: A177332 A177333 A177334 * A177336 A177337 A177338

Keyword

nonn

Author

Juri-Stepan Gerasimov, May 08 2010

Extensions

Verified and extended by D. S. McNeil, May 10 2010

Status

approved