A288890 - OEIS

A288890

Primes of the form k!4+2, where k!4 is the quadruple factorial number (A007662).

3, 5, 7, 23, 47, 233, 587, 3467, 65837, 40883537, 151412627, 1267389587, 74389431691577, 885821206052908127, 13005556505149168230729834377, 583723376551025432768079734666930727861956890308512536691015627

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OFFSET

1,1

LINKS

Robert Price, Table of n, a(n) for n = 1..22

Henri& Renaud Lifchitz, PRP Records.Search for n!4+2.

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, 4] + 2, {i, 0, 100}], PrimeQ[#]&]

Select[Table[Times@@Range[k, 1, -4]+2, {k, 150}], PrimeQ] (* Harvey P. Dale, Nov 24 2024 *)

CROSSREFS

Cf. A007662, A283553.

Sequence in context: A057182 A038916 A019363 * A120384 A216124 A096505

Adjacent sequences: A288887 A288888 A288889 * A288891 A288892 A288893

KEYWORD

nonn,changed

AUTHOR

Robert Price, Jun 18 2017

STATUS

approved