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A051915
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Numbers n such that 2*n! + 1 is a prime.
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9
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0, 1, 2, 3, 5, 12, 18, 35, 51, 53, 78, 209, 396, 4166
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| Used PrimeForm to prove primality for n = 4166 (classical N-1 test) - David Radcliffe (dradcliffe(AT)gmail.com), May 28 2007
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EXAMPLE
| n=5 is here because 2*5!+1=241 is a prime.
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CROSSREFS
| Cf. A051888.
Sequence in context: A002139 A140489 A193776 * A064688 A089891 A004689
Adjacent sequences: A051912 A051913 A051914 * A051916 A051917 A051918
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Dec 18 1999
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EXTENSIONS
| 4166 from David Radcliffe (dradcliffe(AT)gmail.com), May 28 2007
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