A109617 Numbers n such that (10's complement factorial of n) - 1 is prime.

2, 3, 4, 7, 77, 337, 397, 566

Offset

1,1

Comments

Larger values not certified.

Links

Table of n, a(n) for n=1..8.

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 A229597 A366656

Adjacent sequences: A109614 A109615 A109616 * A109618 A109619 A109620

Keyword

more,nonn,base

Author

Jason Earls, Aug 01 2005

Status

approved