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Old 2013-03-04, 07:46   #3
LaurV
Romulan Interpreter
 
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Jun 2011
Thailand

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Quote:
Originally Posted by kgr View Post
M49 with exponent 536870911
M50 with exponent 2147483647
Code:
gp > tf_60c(num,0,10^5)
M2147483647 has a factor: 295257526626031
gp > ##
  ***   last result computed in 140 ms.
gp >
so much for your conjecture...

edit @SB: good catch, I did not realize, hehe, shame on me! I wasted the time to launch pari ... (and just few weeks ago I pretended to know all powers of 2 up to some limit, grrr...)

Last fiddled with by LaurV on 2013-03-04 at 07:53
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