A288885 Primes of the form k!3 + 3^9, where k!3 is the triple factorial number (A007661).
19687, 19763, 19963, 20563, 32003, 229123, 4208483, 24364003, 72642189283, 2324549446883, 5577337931669523683, 38900816605808456499219683, 26070192823309041523916819683
Offset: 1
Keywords
Links
- Robert Price, Table of n, a(n) for n = 1..18
- Henri and Renaud Lifchitz, PRP Records.Search for n!3+3^9.
- Joe McLean, Interesting Sources of Probable Primes.
- OpenPFGW Project, Primality Tester.
Programs
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Mathematica
MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]]; Select[Table[MultiFactorial[i, 3] + 3^9, {i, 0, 100}], PrimeQ[#]&] Select[Table[Times@@Range[n,1,-3]+19683,{n,100}],PrimeQ] (* Harvey P. Dale, Sep 18 2023 *)