A289861 Primes of the form k!10-2, where k!10 is the decuple factorial number (A288327).

2, 3, 5, 7, 37, 73, 229, 1873, 4957, 7159, 29599, 293599, 2953123, 9476647, 1643049664639, 30501459767616059381067752838134765623, 75901465778001946800870398616055887199, 168354282831355577455162448188672669399, 73004868196707960876168803928840928829809

Offset

1,1

Links

Robert Price, Table of n, a(n) for n = 1..32

Henri & Renaud Lifchitz, PRP Records.Search for n!10-2.

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, 10] - 2, {i, 3, 100}], PrimeQ[#]&]
Select[Table[Times@@Range[n, 1, -10]-2, {n, 300}], PrimeQ] (* Harvey P. Dale, Sep 09 2021 *)

Crossrefs

Cf. A283559.

Sequence in context: A048416 A048401 A288718 * A160748 A117639 A202263

Adjacent sequences: A289858 A289859 A289860 * A289862 A289863 A289864

Keyword

nonn

Author

Robert Price, Jul 13 2017

Status

approved