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Search: id:A023271
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| A023271 |
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Numbers n such that n remains prime through 3 iterations of function f(x) = x + 6. |
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8
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| 5, 11, 41, 61, 251, 601, 641, 1091, 1481, 1601, 1741, 1861, 2371, 2671, 3301, 3911, 4001, 5101, 5381, 5431, 5641, 6311, 6361, 9461, 11821, 12101, 12641, 13451, 14621, 14741, 15791, 15901, 17471, 18211, 19471, 20341, 21481, 23321, 24091, 26171, 26681
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Smallest member of a sexy prime quadruple: value of p where (p,p+6,p+12,p+18) are all prime.
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LINKS
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Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
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MATHEMATICA
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lst={}; Do[p=Prime[n]; If[PrimeQ[p+6]&&PrimeQ[p+12]&&PrimeQ[p+18], AppendTo[lst, p]], {n, 8!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Aug 29 2008]
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CROSSREFS
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Cf. A023201, A046117.
Cf. A046122, A046123, A046124.
Adjacent sequences: A023268 A023269 A023270 this_sequence A023272 A023273 A023274
Sequence in context: A154297 A089441 A046121 this_sequence A159049 A047976 A006382
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KEYWORD
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nonn
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AUTHOR
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David W. Wilson (davidwwilson(AT)comcast.net)
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