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 A289819 Primes of the form k!3-81, where k!3 is the triple factorial number (A007661). 1
 199, 3559, 12239, 209359, 4188719, 2504902319, 72642169519, 528271743919, 2324549427119, 13106744139423334399919, 2295148179742698933452799919, 254451773522587035734629406212095999919, 281238294844900882734503454910185471999919 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS 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 MATHEMATICA MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]]; Select[Table[MultiFactorial[i, 3] - 81, {i, 9, 100}], PrimeQ[#]&] CROSSREFS Cf. A247464. Sequence in context: A086977 A324628 A216346 * A195523 A163712 A069244 Adjacent sequences:  A289816 A289817 A289818 * A289820 A289821 A289822 KEYWORD nonn AUTHOR Robert Price, Jul 12 2017 STATUS approved

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Last modified August 12 21:52 EDT 2022. Contains 356077 sequences. (Running on oeis4.)