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Search: id:A139057
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| A139057 |
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a(n) = prime numbers of the form (k!!-3)/3. |
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+0
45
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| 7, 239, 159667199, 6974263295999, 2947253997913233984847871999999, 98410933013201380282539536547839999999, 20138421021124611879118377356171332502421503999999999
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OFFSET
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1,1
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COMMENT
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Numbers k for which (-3 + k!!)/3 is prime see A139056
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MATHEMATICA
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a = {}; Do[If[PrimeQ[(-3 + n!!)/3], AppendTo[a, [(-3 + n!!)/3]], {n, 1, 1000}]; a
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CROSSREFS
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Cf. A089085, A117141, A007749, A139056.
Sequence in context: A160491 A120661 A159967 this_sequence A086214 A133589 A142805
Adjacent sequences: A139054 A139055 A139056 this_sequence A139058 A139059 A139060
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Apr 07 2008
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