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A289634 Primes of the form k!3-3, where k!3 is the triple factorial number (A007661). 1
7, 277, 877, 3637, 58237, 24344317, 17041023997, 44656330909544934316361777151999997, 3304568487306325139410771509247999997, 17994728558292550488813850298696914425610239999997, 2136063198892150618502015301628828867230815945271103455231999999997 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Robert Price, Table of n, a(n) for n = 1..17

Henri & Renaud Lifchitz, PRP Records.Search for n!3-3.

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, 3] - 3, {i, 4, 100}], PrimeQ[#]&]

CROSSREFS

Cf. A242994.

Sequence in context: A066413 A332127 A222942 * A065581 A062646 A009503

Adjacent sequences:  A289631 A289632 A289633 * A289635 A289636 A289637

KEYWORD

nonn

AUTHOR

Robert Price, Jul 12 2017

STATUS

approved

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Last modified February 29 01:11 EST 2020. Contains 332353 sequences. (Running on oeis4.)