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A139201
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Numbers k such that (k!-6)/6 is prime.
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1
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4, 5, 7, 8, 11, 14, 16, 17, 18, 20, 43, 50, 55, 59, 171, 461, 859
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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MAPLE
| a:=proc(n) if isprime((1/6)*factorial(n)-1)=true then n else end if end proc: seq(a(n), n=4..500); -Emeric Deutsch (deutsch(AT)duke.poly.edu), Apr 29 2008
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MATHEMATICA
| a = {}; Do[If[PrimeQ[(n! - 6)/6], 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: A032702 A120753 A188322 * A049649 A050575 A081452
Adjacent sequences: A139198 A139199 A139200 * A139202 A139203 A139204
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KEYWORD
| nonn
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AUTHOR
| Artur Jasinski (grafix(AT)csl.pl), Apr 11 2008
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EXTENSIONS
| 2 more terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Apr 29 2008
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