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A289856 Primes of the form k!2-256, where k!2 is the double factorial number (A006852). 1
10139, 2026769, 13749310319, 213458046676619, 191898783962510369, 157952079428395476360490147277859119, 29215606371473169285018060091249259296619, 2395415678676082004163677716234578672981800778515369 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Robert Price, Table of n, a(n) for n = 1..12

Henri & Renaud Lifchitz, PRP Records.Search for n!2-256.

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, 2] - 256, {i, 8, 100}], PrimeQ[#]&]

CROSSREFS

Cf. A265114.

Sequence in context: A159863 A234180 A054037 * A023066 A248487 A172810

Adjacent sequences:  A289853 A289854 A289855 * A289857 A289858 A289859

KEYWORD

nonn

AUTHOR

Robert Price, Jul 13 2017

STATUS

approved

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Last modified May 31 06:22 EDT 2020. Contains 334747 sequences. (Running on oeis4.)