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A289819
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Primes of the form k!3-81, where k!3 is the triple factorial number (A007661).
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1
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199, 3559, 12239, 209359, 4188719, 2504902319, 72642169519, 528271743919, 2324549427119, 13106744139423334399919, 2295148179742698933452799919, 254451773522587035734629406212095999919, 281238294844900882734503454910185471999919
(list;
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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..19
Henri & Renaud Lifchitz, PRP Records.Search for n!3-81.
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] - 81, {i, 9, 100}], PrimeQ[#]&]
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CROSSREFS
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Cf. A247464.
Sequence in context: A086977 A324628 A216346 * A195523 A163712 A069244
Adjacent sequences: A289816 A289817 A289818 * A289820 A289821 A289822
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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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