A176821 List of 4-tuples of twin primes q, p, p+2 and q+2 such that 2*q<p<p+2<2*(q+2).

5, 11, 13, 7, 29, 59, 61, 31, 659, 1319, 1321, 661, 809, 1619, 1621, 811, 2129, 4259, 4261, 2131, 2549, 5099, 5101, 2551, 3329, 6659, 6661, 3331, 3389, 6779, 6781, 3391, 5849, 11699, 11701, 5851, 6269, 12539, 12541, 6271, 10529, 21059, 21061, 10531

Offset

1,1

Comments

The first number q in each quadruplet is in A069142 (equivalent to selecting twin primes q which are also Sophie-Germain primes). [From R. J. Mathar, May 06 2010]

Links

Table of n, a(n) for n=1..44.

Crossrefs

Cf. A077800, A045536.

Sequence in context: A102181 A103068 A277136 * A070369 A357995 A104215

Adjacent sequences: A176818 A176819 A176820 * A176822 A176823 A176824

Keyword

nonn,tabf

Author

Juri-Stepan Gerasimov, Apr 26 2010, May 01 2010, May 07 2010

Extensions

Corrected (2131 replaced by 3331) by R. J. Mathar, May 06 2010

Status

approved