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A288371
Primes of the form k!9+1, where k!9 is the nonuple factorial number (A114806).
1
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
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
KEYWORD
nonn
AUTHOR
Robert Price, Jun 08 2017
STATUS
approved