20170112, 08:38  #1 
"KarlHeinz Hofmann"
Jan 2017
Gr.Rohrheim Germany
10111_{2} 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
10001110100101_{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
23 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
27_{8} 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
13·19^{2} Posts 

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