I use Sage 6.1.1 which I build from source code on my x86 Ubuntu14.04 William Stein <wst...@gmail.com>提到：
> >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. -- 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.
