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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
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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:
A250712
A362217
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 April 23 02:23 EDT 2024. Contains 371906 sequences. (Running on oeis4.)