A288883 Primes of the form k!3 + 3^7, where k!3 is the triple factorial number (A007661).

2267, 2467, 3067, 5827, 60427, 1108747, 4190987, 24346507, 664565853954187, 3091650738178187, 262134882788466690187, 571241722682644258978777268224002187, 1189733928480144370053771930898033195089920002187, 17994728558292550488813850298696914425610240002187

Offset

1,1

Links

Robert Price, Table of n, a(n) for n = 1..18

Henri& Renaud Lifchitz, PRP Records.Search for n!3+3^7.

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, 3] + 3^7, {i, 0, 100}], PrimeQ[#]&]

Crossrefs

Cf. A265200.

Sequence in context: A263972 A263963 A272376 * A206212 A154673 A130179

Adjacent sequences: A288880 A288881 A288882 * A288884 A288885 A288886

Keyword

nonn

Author

Robert Price, Jun 18 2017

Status

approved