A288371 Primes of the form k!9+1, where k!9 is the nonuple factorial number (A114806).

2, 3, 5, 7, 11, 23, 37, 53, 71, 113, 137, 163, 191, 757, 2161, 2801, 51521, 1418561, 4093601, 42456961, 69509441, 105616001, 2420046721, 9160905601, 1270453824641, 2326680294401, 190787784140801, 509498986796801, 2805949277824001, 612940220628736001

Offset

1,1

Links

Robert Price, Table of n, a(n) for n = 1..55

OpenPFGW Project, Primality Tester

Mathematica

MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
Select[Table[MultiFactorial[i, 9] + 1, {i, 0, 100}], PrimeQ[#]&]

Crossrefs

Cf. A204660.

Sequence in context: A068853 A328076 A236400 * A158217 A030284 A252791

Adjacent sequences: A288368 A288369 A288370 * A288372 A288373 A288374

Keyword

nonn

Author

Robert Price, Jun 08 2017

Status

approved