A288304 Primes of the form k!6+9, where k!6 is the sextuple factorial number (A085158).

11, 13, 233, 394249, 13404169, 24663654409, 311607296009, 1282510028809, 37455569511954513920009, 1717927167842495286476800009, 182100279791304500366540800009, 131285558488477016219820351299780608000009, 453537748960814664854433903259753397239152640000009

Offset

1,1

Links

Robert Price, Table of n, a(n) for n = 1..19

Henri& Renaud Lifchitz, PRP Records.Search for n!6+9.

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, 6]+9, {i, 0, 100}], PrimeQ[#]&]

Crossrefs

Cf. A288154.

Sequence in context: A064759 A238090 A093605 * A155967 A111070 A110115

Adjacent sequences: A288301 A288302 A288303 * A288305 A288306 A288307

Keyword

nonn

Author

Robert Price, Jun 07 2017

Status

approved