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A139057
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a(n) = prime numbers of the form (k!!-3)/3.
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44
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7, 239, 159667199, 6974263295999, 2947253997913233984847871999999, 98410933013201380282539536547839999999, 20138421021124611879118377356171332502421503999999999
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Numbers k for which (-3 + k!!)/3 is prime see A139056
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MATHEMATICA
| a = {}; Do[If[PrimeQ[(-3 + n!!)/3], AppendTo[a, [(-3 + n!!)/3]], {n, 1, 1000}]; a
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CROSSREFS
| Cf. A089085, A117141, A007749, A139056.
Sequence in context: A120661 A185389 A159967 * A200961 A086214 A133589
Adjacent sequences: A139054 A139055 A139056 * A139058 A139059 A139060
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KEYWORD
| nonn
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AUTHOR
| Artur Jasinski (grafix(AT)csl.pl), Apr 07 2008
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