On Jun 21, 2014 7:17 PM, "gofortu...@gmail.com" <gofortu...@gmail.com> wrote: > > I didn't get such answer as you got,my Sage factor 2007193456621 correctly. > N.factor() returns 1001797*2003593. > Did you use an old version of Sage? >
What version are *you* using? > > > 發自我的小米手機 > > John Cremona <john.crem...@gmail.com>提到： > > >I noticed an announcement on the flint-dev list which led me to try > >this, and indeed we have the bug: > > > >sage: n=2007193456621 > >sage: n.is_prime() > >False > >sage: n.factor() # !!!!!!!!!! > >2007193456621 > >sage: pari(n).factor() > >[1001797, 1; 2003593, 1] > >sage: n == 1001797 * 2003593 > >True > > > >See flint-dev for more details, but this seems serious enough to > >report here too. I do not understand why Sage fails to factor n since > >the documentation says that pari is the default, and pari can factor > >this n (as above), however: > > > >sage: n.factor(algorithm='pari') > >2007193456621 > > > >but > > > >sage: from sage.rings.factorint import factor_using_pari > >sage: factor_using_pari(n) > >[(1001797, 1), (2003593, 1)] > > > >so something is going wrong before pari is getting called, perhaps a > >primality test? > > > >John > > > >-- > >You received this message because you are subscribed to the Google Groups "sage-devel" group. > >To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. > >To post to this group, send email to sage-devel@googlegroups.com. > >Visit this group at http://groups.google.com/group/sage-devel. > >For more options, visit https://groups.google.com/d/optout. > > -- > You received this message because you are subscribed to the Google Groups "sage-devel" group. > To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. > To post to this group, send email to sage-devel@googlegroups.com. > Visit this group at http://groups.google.com/group/sage-devel. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
