[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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