I've changed: primelimit=2000, block length=magic_constant=8000.
Note that there will be much more prp tests, but it's cost is still small, in every cases I think this is about 2 times faster than previous was. I've tested this only for n=44,47.
You can download it from
http://www.robertgerbicz.tar.hu/dodeca_3_0.exe
Or see the attachment for the c code!