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A139202
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Numbers k such that (k!-7)/7 is prime.
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1
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7, 9, 20, 23, 46, 54, 57, 71, 85, 387, 396, 606, 1121, 2484
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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MATHEMATICA
| a = {}; Do[If[PrimeQ[(n! - 7)/7], Print[a]; AppendTo[a, n]], {n, 1, 300}]; a (*Artur Jasinski*)
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CROSSREFS
| Cf. A139189, A139190, A139191, A139192, A139193, A139194, A139195, A139196, A139197, A139198.
Sequence in context: A074343 A103853 A192160 * A125968 A147068 A147012
Adjacent sequences: A139199 A139200 A139201 * A139203 A139204 A139205
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KEYWORD
| hard,more,nonn
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AUTHOR
| Artur Jasinski (grafix(AT)csl.pl), Apr 11 2008
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EXTENSIONS
| More terms from Alexis Olson (AlexisOlson(AT)gmail.com), Nov 14 2008
a(13)-a(14) PRPs from Sean A. Irvine (sairvin(AT)xtra.co.nz), Aug 05 2010
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