OFFSET
1,1
COMMENTS
Sequence A084438 gives the easier-to-read n-values.
All terms greater than a(3) seem to end in the digit 9, or many 9 digits. a(17) ends with 51 9 digits. - Harvey P. Dale, Nov 28 2019
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..17
Ken Davis, Status of Search for Multifactorial Primes
Ken Davis, Results for n!3-1.
ProthSearch.net (on web.archive.org), n3minus.txt
EXAMPLE
a(4) = 79 = 8x5x2-1 = 8!!!-1 is the 4th prime of that form.
MATHEMATICA
Select[Table[Times@@Range[n, 1, -3], {n, 150}]-1, PrimeQ] (* Harvey P. Dale, Nov 28 2019 *)
PROG
CROSSREFS
KEYWORD
nonn
AUTHOR
M. F. Hasler, Nov 26 2007
STATUS
approved