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A289729
Primes of the form k!6-9, where k!6 is the sextuple factorial number (
A085158
).
1
7, 31, 631, 14071, 116471, 24663654391, 1282510028791, 17450008575991, 333247405883391991, 5444123475574783991
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OFFSET
1,1
LINKS
Harvey P. Dale,
Table of n, a(n) for n = 1..18
Henri & Renaud Lifchitz,
PRP Records.Search for n!6-9.
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, 6] - 9, {i, 8, 100}], PrimeQ[#]&]
Select[Table[Times@@Range[n, 1, -6]-9, {n, 8, 100}], PrimeQ] (*
Harvey P. Dale
, Aug 21 2023 *)
CROSSREFS
Cf.
A289687
.
Sequence in context:
A139287
A139307
A197451
*
A197301
A280038
A253640
Adjacent sequences:
A289726
A289727
A289728
*
A289730
A289731
A289732
KEYWORD
nonn
AUTHOR
Robert Price
, Jul 10 2017
STATUS
approved
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Last modified April 23 12:55 EDT 2024. Contains 371913 sequences. (Running on oeis4.)