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Search: id:A046118
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| A046118 |
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Smallest member of a sexy prime triple: value of p where (p,p+6,p+12) are all prime but p+18 is not (although p-6 might be.) |
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4
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| 7, 17, 31, 47, 67, 97, 101, 151, 167, 227, 257, 271, 347, 367, 557, 587, 607, 647, 727, 941, 971, 1097, 1117, 1181, 1217, 1277, 1291, 1361, 1427, 1447, 1487, 1607, 1657, 1747, 1777, 1867, 1901, 1987, 2131, 2281, 2377, 2411, 2677, 2687, 2707, 2791
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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p-6 will be prime if the prime triple contains the last 3 primes of a sexy prime quadruple.
If a sexy prime triple happens to include the last 3 members of a sexy prime quadruple this sequence will contain the sexy prime triple's smallest member, e.g. a(4)=47 is the smallest member of the sexy prime triple (47, 53, 59), but is also the second member of the sexy prime quadruple (41, 47, 53, 59). [From Daniel Forgues (squid(AT)zensearch.com), Aug 05 2009]
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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, 7!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Aug 29 2008]
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CROSSREFS
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Cf. A023201, A046117.
Cf. A046119, A046120.
Sequence in context: A006142 A001123 A094080 this_sequence A120092 A130284 A056220
Adjacent sequences: A046115 A046116 A046117 this_sequence A046119 A046120 A046121
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KEYWORD
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nonn
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AUTHOR
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Eric Weisstein (eric(AT)weisstein.com)
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EXTENSIONS
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Definition edited by Daniel Forgues, Aug 12 2009
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