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Search: id:A051644
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| A051644 |
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Primes of the form 6p+1 where p is also prime. |
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+0
5
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| 13, 19, 31, 43, 67, 79, 103, 139, 223, 283, 367, 439, 499, 607, 619, 643, 787, 823, 907, 1039, 1087, 1399, 1447, 1543, 1579, 1627, 1663, 1699, 1759, 1867, 1879, 1987, 2083, 2203, 2239, 2383, 2659, 2767, 2803, 3019, 3343, 3463, 3559, 3607, 3643, 3847, 3919
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Analogous to A005385; can be called 6-safe primes.
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FORMULA
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a(n) = 6*A007693(n) + 1.
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EXAMPLE
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103 is here because it is prime and (103-1)/6=17 is prime.
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MATHEMATICA
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Select[1 + 6Prime@Range[120], PrimeQ] (*Chandler*)
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CROSSREFS
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Cf. A005384, A005385, A002476, A007693, A016921, A024899, A091178.
Adjacent sequences: A051641 A051642 A051643 this_sequence A051645 A051646 A051647
Sequence in context: A085413 A069324 A040047 this_sequence A101408 A023252 A128342
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu)
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EXTENSIONS
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Edited, corrected and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Mar 14 2007
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