Re: factor
- To: mathgroup@smc.vnet.net
- Subject: [mg12533] Re: factor
- From: dwcp <dwcp@mail.nerc-essc.ac.uk>
- Date: Sat, 23 May 1998 18:11:00 -0400
- Organization: ESSC
- References: <6jol0g$k67@smc.vnet.net>
I'm responding to the list as well as by email, to demonstrate the useful FactorIntegerECM. The calc below took a few minutes. FactorInteger had been running for several hours without output when I stopped it. -David. In[1]:= <<NumberTheory`FactorIntegerECM` In[2]:= FactorIntegerECM[ (10^79-1) / 9 ] Out[2]= 6172891015272307 In[3]:= ( (10^79-1) / 9 ) / % Out[3]= 179998498007192867978127821006182312868256693827421272815886173 William Moppett wrote: > > help > can anyone give me a factor of (10^71 - 1)/9 Mathematica 3.0 says it is > not prime email > wmoppet@nsw.bigpond.net.au -- David Pearson, Phone: +44 (0)118 9318741 ESSC, Fax: +44 (0)118 9316413 University of Reading, Reading RG6 6AL, Email: dwcp@mail.nerc-essc.ac.uk UK.