A289858 Primes of the form k!2-1024, where k!2 is the double factorial number (A006852).

9371, 34458401, 191898783962509601, 319830986772877770814601, 157952079428395476360490147277858351, 2987435000850314871976096554696085799164511452611632783323554397412108351, 283806325080779912837729172696128150920628587998105114415737667754150389601

Offset

1,1

Links

Robert Price, Table of n, a(n) for n = 1..7

Henri & Renaud Lifchitz, PRP Records.Search for n!2-1024.

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] - 1024, {i, 10, 100}], PrimeQ[#]&]

Crossrefs

Cf. A258866.

Sequence in context: A330902 A323803 A246736 * A259001 A259008 A256899

Adjacent sequences: A289855 A289856 A289857 * A289859 A289860 A289861

Keyword

nonn

Author

Robert Price, Jul 13 2017

Status

approved