Source code for a siever is here:
C factorial prime siever.
You're on your own; this is entirely in the public domian - change it, tweak it, whatever it.
The results of sieving n!+/-1 for n=30000 to 100000 up to p=6G are here:
factorial composite list
If you are interested in these things, then you should be part of Nuutti Kuosa's coordinated factorial prime search.
If you find a large prime having used these files, can you at least make mention of me, and my beloved Alpha, which did the sieving!
Phil Carmody, 24/04/2002