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A289817
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Primes of the form k!3-9, where k!3 is the triple factorial number (A007661).
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1
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19, 71, 271, 3631, 58231, 209431, 4188791, 96342391, 17041023991, 72642169591, 2324549427191, 1143053268797439991, 52580450364682239991, 262134882788466687991, 694657439389436723199991, 38900816605808456499199991, 2295148179742698933452799991
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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Robert Price, Table of n, a(n) for n = 1..24
Henri & Renaud Lifchitz, PRP Records.Search for n!3-9.
Joe McLean, Interesting Sources of Probable Primes
OpenPFGW Project, Primality Tester
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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, 3] - 9, {i, 5, 100}], PrimeQ[#]&]
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CROSSREFS
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Cf. A243078.
Sequence in context: A226802 A142516 A127874 * A321343 A255889 A154406
Adjacent sequences: A289814 A289815 A289816 * A289818 A289819 A289820
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KEYWORD
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nonn
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AUTHOR
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Robert Price, Jul 12 2017
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STATUS
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approved
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