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Search: id:A090686
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| A090686 |
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Primes of the form 6n^2-1. |
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+0
13
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| 5, 23, 53, 149, 293, 383, 599, 863, 1013, 1733, 2399, 2903, 4373, 4703, 5399, 6143, 7349, 8663, 11093, 12149, 16223, 18149, 20183, 21599, 23063, 23813, 25349, 27743, 29399, 31973, 33749, 35573, 40343, 41333, 45413, 51893, 56453, 59999, 62423
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Subset of A007528. The n for which 6*n^2 - 1 is prime are 1, 2, 3, 5, 7, 8, 10, 12, 13, 17, 20, 22, 27, 28, 30, 32, 35, 38, 43, 45, 52, 55, 58, 60, 62, 63, 65, 68, 70, 73, 75, 77, 82, 83, 87, 93, 97, 100, ... - Jonathan Vos Post (jvospost3(AT)gmail.com), Aug 27 2006
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MATHEMATICA
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lst={}; Do[p=6*n^2-1; If[PrimeQ[p], AppendTo[lst, p]], {n, 0, 3*5!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Jan 27 2009]
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PROGRAM
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(PARI) mx2pmp(n) = { for(x=1, n, y = 6*x^2-1; if(isprime(y), print1(y", ")) ) }
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CROSSREFS
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Cf. A000040, A007528, A090687.
Sequence in context: A127200 A147113 A140811 this_sequence A082277 A155851 A019267
Adjacent sequences: A090683 A090684 A090685 this_sequence A090687 A090688 A090689
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KEYWORD
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easy,nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Dec 18 2003
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com) at the suggestion of R. J. Mathar, Apr 14 2008
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