[seqfan] Re: FYI - extending A134753

Klaus Brockhaus klaus-brockhaus at t-online.de
Thu Mar 5 07:31:38 CET 2009


Dmitry Kamenetsky wrote:
> 
> According to my computations, 3^(4*38998-1)+2 is divisible by 29, so it
> is not prime.

I confirm Dmitry's result.

Klaus

------------------------------

? \v
                  GP/PARI CALCULATOR Version 2.3.0 (released)
                i686 running cygwin (ix86 kernel) 32-bit version
 compiled: May 22 2006, gcc-3.4.4 (cygming special) (gdc 0.12, using dmd 0.125)
              (readline v5.1 enabled, extended help not available)
? (3^(4*38998-1)+2)%29
time = 628 ms.
%771 = 0
? factor((3^(4*38998-1)+2),100)
time = 2,801 ms.
%772 = 
[29 1]

[1442935694816994191134734611834622521514631869152808540207253681
...................
78079015048460435060562035753009087405972217411844693568932081 1]




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