On Wed, Oct 20, 2010 at 09:10:37PM +0200, bodr...@mail.dm.unipi.it wrote:
> Package: pari-gp
> Version: 2.3.5-1
> Severity: normal
>
> ispower(x) should return the maximal $n$ such that an $a$ exists with
> $a^n=x$.
> But the following example session shows that this is not correctly computed.
>
> $ /usr/bin/gp -q
> ? ?ispower
> ispower(x,{k},{&n}): true (1) if x is a k-th power, false (0) if not. If n is
> given and a k-th root was computed in the process, put that in n. If k is
> omitted, return the maximal k >= 2 such that x = n^k is a perfect power, or 0
> if no such k exist.
> ? ispower(2^413)
> 59
Hello Marco, this is a known problem in PARI 2.3.4, which is fixed in PARI
2.3.5.
You are reporting that you are using gp 2.3.5-1, but you are still using PARI
2.3.4:
> Versions of packages pari-gp depends on:
> ii libpari2-gmp 2.3.4-1 PARI/GP Computer Algebra
Please upgrade libpari2-gmp to 2.3.5-1 to get PARI 2.3.5 which fix this bug
>From the 2.3.5 CHANGES file:
8- ispower broken due to insufficient precision [#916] [F40]
Cheers,
--
Bill. <ballo...@debian.org>
Imagine a large red swirl here.
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