A109758 - OEIS

A109758

Numbers k such that (10's complement factorial of k) - 1 is semiprime.

5, 6, 10, 13, 20, 22, 23, 24, 27, 29, 33, 40, 41, 43, 46, 51, 54, 79, 80, 83, 85, 93, 106, 111

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OFFSET

1,1

COMMENTS

Sequence possibly continues with 112, 137, 145, 148, 163, 165, 177, 190, 196, 197. 206 is the next certain term. - Tyler Busby, Feb 09 2023

LINKS

CROSSREFS

KEYWORD

more,nonn,base

AUTHOR

Jason Earls, Aug 12 2005

EXTENSIONS

More terms from Sean A. Irvine, Sep 18 2012

STATUS

approved