A288716 Primes of the form k!8+2, where k!8 is the octuple factorial number (A114800).

3, 5, 7, 11, 67, 107, 1367, 2417, 16931, 126227, 592517, 65909027, 3493178327, 7547514977, 14454403427, 385235284982627, 2667042724170827, 98523573068265783062627, 121598818552526868243555286516922298627484453127

Offset

1,1

Links

Robert Price, Table of n, a(n) for n = 1..25

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, 0, 100}], PrimeQ[#]&]

Crossrefs

Cf. A204663.

Sequence in context: A137355 A147143 A006034 * A083840 A088051 A159471

Adjacent sequences: A288713 A288714 A288715 * A288717 A288718 A288719

Keyword

nonn

Author

Robert Price, Jun 13 2017

Status

approved