#7239: factorization of Cunningham numbers
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Reporter: ylchapuy | Owner: tbd
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.3
Component: factorization | Keywords:
Work_issues: | Author: Yann Laigle-Chapuy
Upstream: N/A | Reviewer:
Merged: |
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Comment(by ylchapuy):
from Jeroen Demeyer:
"You are certainly welcome to use this data (I don't think pure data like
this can be copyrighted anyway). I actually know about Sage (even
though I use PARI/GP myself) and certainly would like to support the
project. It is not entirely clear what your function should do: it is
supposed to be incorporated into the general factor() function or do you
plan to add a special function somehow? I'm just asking so that I can
help you better.
You might also want to have at my fullfactor() PARI/GP package (see
http://cage.ugent.be/~jdemeyer/parigp/fullfactor.html). This is a
package I wrote with some helper functions for factoring (some unrelated
to the Cunningham tables). It contains a function factor_cyclo(n) which
basically tries to find factors of cyclotomic polynomials in a given
number. It then looks these factors up in the Cunningham tables. It
also contains some more low-level functions to help with the
factorization of numbers of the form `b^e-1` (or divisors of these).
The code works but I admit it is not very good-looking. Note however
that this code has been written for PARI/GP 2.4 while Sage still uses
PARI/GP 2.3 I believe.
Best regards,
Jeroen."
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7239#comment:10>
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