A289759 Primes of the form k!8-2, where k!8 is the octuple factorial number (A114800).

2, 3, 5, 7, 31, 103, 151, 3823, 16927, 126223, 137227543, 76663738303, 475493443423, 1132114642884223, 232032717002861773, 494437513909964623, 8949366251999798623, 22043108115271868623, 30822262564469609858623, 29990243754746489604765373

Offset

1,1

Links

Robert Price, Table of n, a(n) for n = 1..32

Henri & Renaud Lifchitz, PRP Records.Search for n!8-2.

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, 8] - 2, {i, 3, 100}], PrimeQ[#]&]

Crossrefs

Cf. A204664.

Sequence in context: A236255 A090711 A067907 * A175611 A278967 A217070

Adjacent sequences: A289756 A289757 A289758 * A289760 A289761 A289762

Keyword

nonn

Author

Robert Price, Jul 11 2017

Status

approved