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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. A006852, 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 September 19 02:20 EDT 2024. Contains 376003 sequences. (Running on oeis4.)