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A289756
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Primes of the form k!8-1, where k!8 is the octuple factorial number (A114800).
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1
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2, 3, 5, 7, 19, 47, 83, 127, 359, 1847, 26879, 55439, 13366079, 188743679, 38761631999, 9033331507199, 3896394330931199, 152349556104345599, 5305528527460761599, 57299708096576225279999, 160680029832131217407999, 383414179456168545484799
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
Select[Table[MultiFactorial[i, 8] - 1, {i, 2, 100}], PrimeQ[#]&]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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