A288881 Primes of the form k!3 + 3^5, where k!3 is the triple factorial number (A007661).

271, 523, 1123, 24344563, 96342643, 608608243, 5577337931669504243, 52580450364682240243, 262134882788466688243, 13106744139423334400243, 694657439389436723200243, 7368624314106569113600243, 12931890526958090978845347074978621685760000243

Offset

1,1

Links

Robert Price, Table of n, a(n) for n = 1..15

Henri& Renaud Lifchitz, PRP Records.Search for n!3+3^5.

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] + 3^5, {i, 0, 100}], PrimeQ[#]&]

Crossrefs

Cf. A007661, A247868.

Sequence in context: A090838 A086708 A142637 * A245969 A157485 A038655

Adjacent sequences: A288878 A288879 A288880 * A288882 A288883 A288884

Keyword

nonn

Author

Robert Price, Jun 18 2017

Status

approved