[seqfan] Re: FYI - extending A134753

[Dmitry Kamenetsky]

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

Dmitry

Alexander Povolotsky wrote:
> From:"Luis H. Gallardo" <Luis.Gallardo at UNIV-BREST.FR>
> To:NMBRTHRY at LISTSERV.NODAK.EDU
> Subject:exponential primes
> Date:Wed, Mar 04, 2009 02:26 PM
> Hello,
> I am computing integers r such that
> p = 3^(4r-1) +2
> is prime
> ((extending A134753))
> computer is actually around r=39541;
> but I have a "hole" just for one lower value
> of r,
> namely for
> r= 38998
> I got:
> luisgall:~> maple: fatal error, lost connection to kernel
> [1]+  Exit 5                  maple <formakowskiX3C >makowskiX3C
> luisgall:~>
> ((after, probably, at least two hours of computation))
> (("isprime", cmaple11, linux machine, 8 processors))
> somebody can help ?
> cordially,
> luis
>
>
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