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Search: id:A139202
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| A139202 |
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Numbers k such that (k!-7)/7 is prime. |
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+0
2
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| 7, 9, 20, 23, 46, 54, 57, 71, 85, 387, 396, 606
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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These are all of the terms for k <= 1000. [From Alexis Olson (AlexisOlson(AT)gmail.com), Nov 14 2008]
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MATHEMATICA
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a = {}; Do[If[PrimeQ[(n! - 7)/7], Print[a]; AppendTo[a, n]], {n, 1, 300}]; a (*Artur Jasinski*)
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CROSSREFS
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Cf. A139189, A139190, A139191, A139192, A139193, A139194, A139195, A139196, A139197, A139198.
Sequence in context: A046257 A074343 A103853 this_sequence A125968 A147068 A147012
Adjacent sequences: A139199 A139200 A139201 this_sequence A139203 A139204 A139205
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KEYWORD
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hard,more,nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Apr 11 2008
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EXTENSIONS
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More terms from Alexis Olson (AlexisOlson(AT)gmail.com), Nov 14 2008
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