20170112, 08:38  #1 
"KarlHeinz Hofmann"
Jan 2017
Gr.Rohrheim Germany
27_{10} Posts 
Why is that Factor not listed ?
On the page :
http://www.mersenne.ca/exponent.php?exponentdetails=47 only two factors are listed. But M47 is fully factored. The factor 13264529 is missing for completness. Why is it not listed ? Greetings from Germany ..... Kalli 
20170112, 15:55  #2 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
10010101011100_{2} Posts 
For most "completely factored" * numbers listed on that page, last factor (a.k.a. "cofactor") is by convention not shown (because it would take pages to show, except for very small entries):
E.g. if M... = a * b * c * cofactor then a, b and c prime factors are listed, and for cofactor search for the line Remaining cofactor is a probableprime Furthermore, in the "Composite Factors" section, only combinations a*b, a*c, b*c will be shown but not "a*cofactor". "It is a feature, not a bug", as they say. _______________ * there is controversy about the use of this term :) hence it is in quotes. 
20170113, 08:18  #3 
"KarlHeinz Hofmann"
Jan 2017
Gr.Rohrheim Germany
27_{10} Posts 
Thank you BATALOV Indeed, those Factors can be very big ...... But M47 has only three factors, and the last Factor seems not too big for me. (13264529). What a pity
In Germany we say: "es es, wie es es" ... in english : "it is, how it is" Thank you ........................ Kalli 
20170113, 08:37  #4 
"KarlHeinz Hofmann"
Jan 2017
Gr.Rohrheim Germany
3^{3} Posts 
On this page:
http://www.mersenne.ca/prp.php?show=...onent=1000#M47 The last Faktor is listed. Another Question: when look at the M59, you see PRP13, as remaining cofactor. Is there a list, where you can see, how those PRPĀ“s look like ? 
20170113, 08:59  #5 
Jun 2003
19×271 Posts 

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