A289853 Primes of the form k!2 - 32, where k!2 is the double factorial number (A006882).

73, 25373791335626257947657609343, 488960130368663401543922783473071784646213671843, 2783097421140216173669833173554685254745646937315554685903182520041762334418182818434647284243799923238034037601108551025390593

Offset

1,1

Links

Robert Price, Table of n, a(n) for n = 1..4

Henri and Renaud Lifchitz, PRP Records.Search for n!2-32.

Joe McLean, Interesting Sources of Probable Primes.

OpenPFGW Project, Primality Tester.

Formula

a(n) = A006882(A262772(n)) - 32. - Elmo R. Oliveira, Apr 14 2025

Mathematica

MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
Select[Table[MultiFactorial[i, 2] - 32, {i, 6, 100}], PrimeQ[#]&]

Crossrefs

Cf. A006882, A262772.

Sequence in context: A384414 A291992 A076848 * A000319 A381235 A033394

Adjacent sequences: A289850 A289851 A289852 * A289854 A289855 A289856

Keyword

nonn

Author

Robert Price, Jul 13 2017

Status

approved