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A289821 Primes of the form k!3-729, where k!3 is the triple factorial number (A007661). 1
151, 2504901671, 664565853951271, 3091650738175271, 26582634158079271, 126757680265215271, 142299187144047333874073599271, 546216992715109618958387336810111087297326406997164406744285183999999999271 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Robert Price, Table of n, a(n) for n = 1..13

Henri & Renaud Lifchitz, PRP Records.Search for n!3-729.

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] - 729, {i, 11, 100}], PrimeQ[#]&]

CROSSREFS

Cf. A247466.

Sequence in context: A206362 A200934 A174759 * A234348 A185394 A097640

Adjacent sequences:  A289818 A289819 A289820 * A289822 A289823 A289824

KEYWORD

nonn

AUTHOR

Robert Price, Jul 12 2017

STATUS

approved

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Last modified September 22 19:36 EDT 2021. Contains 347608 sequences. (Running on oeis4.)