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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). 3
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 (list; graph; refs; listen; history; text; internal format)
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 A104215 A287123

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

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Last modified December 2 02:12 EST 2021. Contains 349435 sequences. (Running on oeis4.)