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Old 2011-11-26, 01:55   #1
davieddy
 
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"Lucan"
Dec 2006
England

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Default Never a dull moment around here

One minute I'm discussing TF to 72,
and the next I am failing to get UncWilly to
grasp that if for some bizarre reason you want
to trawl the exponents <1 Billion for factors,
it would be better to work downwards.

David
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Old 2011-11-26, 02:34   #2
science_man_88
 
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Quote:
Originally Posted by davieddy View Post
if for some bizarre reason you want
to trawl the exponents <1 Billion for factors,
it would be better to work downwards.
really, on second thought I don't see it as bizarre because 2*k*p+1 if k= composite such that it breaks into 2 primes r,s smaller than p such that 2*k*p+1 is lower than 2^r-1 or 2^s-1 or both. if k is prime switch p and k you've now got a impossible factor of 2^k-1 if 2*k*p+1 is less than 2^k-1. the bizarre part for me would be the likelihood of such happening.

edit: k could also be composite * prime and be composite.

Last fiddled with by science_man_88 on 2011-11-26 at 02:35
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