G'morning David, 

 DW> To me, it makes more sense to think that the PRINTing is taking up a
 DW> large fraction of the time, so speeding up the calculations is having
 DW> little effect. If you disable the PRINT line, and make it calculate out
 DW> to  A=45000 so as to take an appreciable time, you should see an
 DW> improvement between the latest version and previous ones.

Right ... I must admit I've been relishing the analysis-and-prune 
process rather than the absolute speed;  I get a feeling that 
seeking absolute speed will corrupt most `rational' processes from 
any explanatory role achieved..

:-)
 
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