primep seems to work with Ecl 11.1.1, only next_prime
yields false results.
And since I get the same results for Maxima 5.21.1 and 5.23.2,
it seems not depending on the Maxima version.
So likely an Ecl bug.
Thanks
Oliver
On Thu, Jan 20, 2011 at 09:18:12AM -0800, Joerg Rauh wrote:
> Hello Oliver,
>
>
> using Maxima 5.22.1 I ran
>
> s:0$
> for i: 1 while i<=1000
> do if primep(i) then (s:s+1, print(i, s));
>
>
> The last line displays: 997 168
>
> So you might consider using version 5.22.1
>
> Best of luck and best regards
>
> Joerg
>
>
>
>
> ________________________________
> From: Oliver Kullmann <O.Kullmann at swansea.ac.uk>
> To: maxima at math.utexas.edu
> Sent: Thu, January 20, 2011 5:14:35 PM
> Subject: next_prime(113) = 121 with Ecl 11.1.1 !
>
> Hello,
>
> Maxima 5.21.1 as well as 5.23.2, built with Ecl 11.1.1,
> has a completely corrupted next_prime function, e.g.
> next_prime(113) = 121 = 11^2
> (determining all "primes" within {1,...,1000} yields 231
> "primes", while there are 168).
>
> Don't know whether this is an Ecl or a Maxima (or a joint) problem.
> Would be good to find out.
>
> In any case, it would be good if Maxima had tests which would catch
> these failures (for example determining all primes within an interval,
> and counting them).
>
> Best regards
>
> Oliver
>
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>
>
>
>
--
Dr. Oliver Kullmann
Computer Science Department
Swansea University
Faraday Building, Singleton Park
Swansea SA2 8PP, UK
http://cs.swan.ac.uk/~csoliver/