A288891 - OEIS

A288891

Primes of the form k!6+2, where k!6 is the sextuple factorial number (A085158).

3, 5, 7, 29, 937, 229637, 13299311027, 678264862277, 2229272062327, 8260613413473469333910627, 204676724960380351177777255683652821505300292407056383439453127, 359539042675600162641430486036393282148945045174959856388131309765627

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Robert Price, Table of n, a(n) for n = 1..15

Henri& Renaud Lifchitz, PRP Records.Search for n!6+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, 6] + 2, {i, 0, 100}], PrimeQ[#]&]

Select[Table[Times@@Range[n, 1, -6]+2, {n, 250}], PrimeQ] (* Harvey P. Dale, Nov 20 2024 *)

CROSSREFS

Cf. A287207.

Sequence in context: A106920 A060273 A124077 * A358699 A322749 A270269

Adjacent sequences: A288888 A288889 A288890 * A288892 A288893 A288894

KEYWORD

nonn,changed

AUTHOR

Robert Price, Jun 18 2017

STATUS

approved