OFFSET
1,1
COMMENTS
a(43) > 10^5.
The first 10 primes associated with this sequence: 2, 3, 5, 53, 89, 21503, 43223, 1339973, 7577953, 49579073.
LINKS
C. Caldwell and H. Dubner (Eds): The top ten prime numbers: from the unpublished collections of R. Ondrejka (May 2001), Table 21 F, p. 75
Ken Davis, Status of Search for Multifactorial Primes.
MATHEMATICA
MultiFactorial[n_, k_] := If[n < 1, 1, n*MultiFactorial[n - k, k]];
Select[Range[2, 50000], PrimeQ[MultiFactorial[#, 6] - 2] &]
Select[Range[100000], PrimeQ[Times@@Range[#, 1, -6]-2]&] (* Harvey P. Dale, Feb 23 2023 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Robert Price, Mar 08 2017
EXTENSIONS
a(39)-a(42) from Robert Price, Jul 09 2017
STATUS
approved