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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
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
CROSSREFS
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