Re: znlog() behavior

Bill Allombert on Sat, 16 Jul 2011 11:54:14 +0200

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Re: znlog() behavior

To: pari-users <pari-users@list.cr.yp.to>
Subject: Re: znlog() behavior
From: Bill Allombert <Bill.Allombert@math.u-bordeaux1.fr>
Date: Sat, 16 Jul 2011 11:52:08 +0200
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On Sat, Jul 16, 2011 at 01:30:13PM +0400, Max Alekseyev wrote:
> I suspect the following error (issued by pari/gp development svn-13224
> version) is a bug, isn't it?
> 
> ? znlog(2,znprimroot(2^67-1))
>   ***   at top-level: znlog(2,znprimroot(2
>   ***                 ^--------------------
>   *** znlog: gen_Shanks_log: supplied order (= 67) is incorrect.

Z/(2^67-1) is not cyclic, so znprimroot(2^67-1) is undefined.
This explain this error.

Cheers,
Bill.

References:
- znlog() behavior
  - From: Max Alekseyev <maxale@gmail.com>

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