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A289550 Primes of the form k!6-4, where k!6 is the sextuple factorial number (A085158). 1
2, 3, 23, 401, 8501, 229631, 623641 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The next term is too large to display.

The next term (a(8)) has 113 digits. - Harvey P. Dale, Dec 09 2020

LINKS

Robert Price, Table of n, a(n) for n = 1..10

Henri & Renaud Lifchitz, PRP Records.Search for n!6-4.

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] - 4, {i, 4, 100}], PrimeQ[#]&]

Select[Table[Times@@Range[n, 1, -6]-4, {n, 3, 100}], PrimeQ] (* Harvey P. Dale, Dec 09 2020 *)

CROSSREFS

Cf. A289547.

Sequence in context: A064888 A104458 A191859 * A154553 A160341 A092388

Adjacent sequences:  A289547 A289548 A289549 * A289551 A289552 A289553

KEYWORD

nonn

AUTHOR

Robert Price, Jul 07 2017

STATUS

approved

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Last modified May 18 23:31 EDT 2022. Contains 353826 sequences. (Running on oeis4.)