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A046954
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Numbers n such that 6n+1 is nonprime.
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9
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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, 133, 140
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| A046954 = A171696 U A121763; A121765 U A171696 = A046953; A121763 U A121765 = A067611 where A067611 U A002822 U A171696 = A001477. [From by Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Feb 13 2010, Feb 15 2010]
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EXAMPLE
| a(2)=8 because 6*8+1=49 which is composite
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MATHEMATICA
| 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
| Cf. A047845 (2n+1), A045751 (4n+1), A127260 (8n+1).
Sequence in context: A163408 A060299 A120512 * A112775 A107747 A121763
Adjacent sequences: A046951 A046952 A046953 * A046955 A046956 A046957
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KEYWORD
| base,nonn
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AUTHOR
| Felice Russo (frusso(AT)micron.com)
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EXTENSIONS
| Edited by N. J. A. Sloane (njas(AT)research.att.com), Aug 08 2008 at the suggestion of R. J. Mathar
Corrected by Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Feb 13 2010, Feb 15 2010
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