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Search: id:A139203
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| A139203 |
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Numbers k such that (k!-8)/8 is prime. |
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+0
2
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| 4, 6, 8, 10, 11, 16, 19, 47, 66, 183, 376, 507
(list; graph; listen)
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OFFSET
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1,1
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MAPLE
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a:=proc(n) if isprime((1/8)*factorial(n)-1)=true then n else end if end proc: seq(a(n), n=4..550); -Emeric Deutsch (deutsch(AT)duke.poly.edu), May 07 2008
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MATHEMATICA
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a = {}; Do[If[PrimeQ[(n! - 8)/8], 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: A020891 A090967 A075254 this_sequence A061408 A063287 A134331
Adjacent sequences: A139200 A139201 A139202 this_sequence A139204 A139205 A139206
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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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2 more terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), May 07 2008
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