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A109617 Numbers n such that (10's complement factorial of n) - 1 is prime. 1
2, 3, 4, 7, 77, 337, 397, 566 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Larger values not certified.
LINKS
EXAMPLE
a(2)=3 because (10-3)*(10-2)*(10-1) - 1 = 503 is prime.
CROSSREFS
Cf. A110396.
Sequence in context: A158652 A127074 A328322 * A181881 A071373 A229597
KEYWORD
more,nonn,base
AUTHOR
Jason Earls, Aug 01 2005
STATUS
approved

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Last modified March 28 10:55 EDT 2024. Contains 371241 sequences. (Running on oeis4.)