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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
Henri & Renaud Lifchitz, PRP Records.Search for n!2-256.
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
Sequence in context: A159863 A234180 A054037 * A023066 A248487 A172810
KEYWORD
nonn
AUTHOR
Robert Price, Jul 13 2017
STATUS
approved

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Last modified March 28 10:31 EDT 2024. Contains 371240 sequences. (Running on oeis4.)