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A068220 Twin primes belonging to packs of four or more twin pairs. 0
9419, 9421, 9431, 9433, 9437, 9439, 9461, 9463, 62969, 62971, 62981, 62983, 62987, 62989, 63029, 63031, 72221, 72223, 72227, 72229, 72251, 72253, 72269, 72271, 392261, 392263, 392267, 392269, 392279, 392281, 392297, 392299, 495569 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A twin pack of primes contains 2 or more pairs of twin primes, between which pairs there are no other primes. 9419,9421,9431,9433,9437,9439,9461,9463 are in the sequence because they are consecutive primes which belong to more than 3 twin pairs. 137,139,149,151 are not because they belong to a pack of only 2 pairs.

Could be called unrestricted prime octets. - Harry J. Smith, Dec 16 2007

LINKS

Table of n, a(n) for n=1..33.

CROSSREFS

Cf. A001097, A035792, A069457.

Sequence in context: A234432 A235677 A235447 * A136145 A035792 A252704

Adjacent sequences:  A068217 A068218 A068219 * A068221 A068222 A068223

KEYWORD

nonn

AUTHOR

Neil Fernandez, Mar 24 2002

EXTENSIONS

More terms from Harry J. Smith, Dec 16 2007

Edited by N. J. A. Sloane, May 15 2008 at the suggestion of R. J. Mathar

STATUS

approved

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Last modified October 18 08:08 EDT 2019. Contains 328146 sequences. (Running on oeis4.)