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A289824 Primes of the form k!3-19683, where k!3 is the triple factorial number (A007661). 1
38557, 189757, 17961239276317, 3091650738156317, 2576442067869429740317, 142299187144047333874073580317, 3304568487306325139410771509247980317, 1745488670154377397414943478973600699284193279980317 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Robert Price, Table of n, a(n) for n = 1..14

Henri & Renaud Lifchitz, PRP Records.Search for n!3-19683.

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] - 19683, {i, 15, 100}], PrimeQ[#]&]

Select[Table[Times@@Range[n, 1, -3]-19683, {n, 15, 100}], PrimeQ] (* Harvey P. Dale, Dec 14 2019 *)

CROSSREFS

Cf. A267029.

Sequence in context: A050766 A250712 A330427 * A321494 A252103 A074484

Adjacent sequences:  A289821 A289822 A289823 * A289825 A289826 A289827

KEYWORD

nonn

AUTHOR

Robert Price, Jul 12 2017

STATUS

approved

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Last modified May 23 16:39 EDT 2022. Contains 353977 sequences. (Running on oeis4.)