On Dec 10, 1:11 am, Irmen de Jong <ir... at -nospam-xs4all.nl> wrote: > 999999999 > == 27 * 37037037 > > What gives? Isn't this thing supposed to factor numbers into the product > of two primes? > > -irmen Only if you yield to it a SEMIprime =) > 27 * 37037037 Now you can apply brent() to these numbers, and so on