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Search: id:A068220
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| A068220 |
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Twin primes belonging to packs of four or more twin pairs. |
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+0
1
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| 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; listen)
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OFFSET
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1,1
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COMMENT
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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 (hjsmithh(AT)sbcglobal.net), Dec 16 2007
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CROSSREFS
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Cf. A001097, A035792, A069457.
Sequence in context: A031595 A031775 A143367 this_sequence A136145 A035792 A161726
Adjacent sequences: A068217 A068218 A068219 this_sequence A068221 A068222 A068223
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KEYWORD
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nonn
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AUTHOR
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N. Fernandez (primeness(AT)borve.org), Mar 24 2002
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EXTENSIONS
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More terms from Harry J. Smith (hjsmithh(AT)sbcglobal.net), Dec 16 2007
Edited by N. J. A. Sloane (njas(AT)research.att.com), May 15 2008 at the suggestion of R. J. Mathar
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