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Numbers k such that (10's complement factorial of k) - 1 is semiprime.
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%I #14 Feb 12 2023 11:45:27

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

%T 111

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

%C 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

%Y Cf. A110396, A109617.

%K more,nonn,base

%O 1,1

%A _Jason Earls_, Aug 12 2005

%E More terms from _Sean A. Irvine_, Sep 18 2012