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Search: id:A046954
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| A046954 |
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Numbers n such that 6n+1 is nonprime. |
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+0
6
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| 0, 4, 8, 9, 14, 15, 19, 20, 22, 24, 28, 29, 31, 34, 36, 39, 41, 42, 43, 44, 48, 49, 50, 53, 54, 57, 59, 60, 64, 65, 67, 69, 71, 74, 75, 78, 79, 80, 82, 84, 85, 86, 88, 89, 92, 93, 94, 97, 98, 99, 104, 106, 108, 109, 111, 113, 114, 116, 117, 119, 120, 124, 127, 129, 130
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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a(2)=8 because 6*8+1=49 which is composite
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MATHEMATICA
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a = Flatten[Table[If[PrimeQ[6*n + 1] == False, n, {}], {n, 0, 50}]] - Roger L. Bagula (rlbagulatfttn(AT)yahoo.com), May 17 2007
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CROSSREFS
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Cf. A047845 (2n+1), A045751 (4n+1), A127260 (8n+1).
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KEYWORD
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base,nonn,new
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AUTHOR
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Felice Russo (felice.russo(AT)katamail.com)
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EXTENSIONS
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Edited by njas, Aug 08 2008 at the suggestion of R. J. Mathar
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