

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
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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



