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
ispower(2^n) should obviously return n, for any integer n>1.
If I recompile the package from upstream, I see no errors. Here is a correct
session:
$ ./gp
Reading GPRC: /etc/gprc ...Done.
GP/PARI CALCULATOR Version 2.3.5 (released)
i686 running linux (ix86/GMP-4.3.2 kernel) 32-bit version
compiled: Oct 20 2010, gcc-4.4.5 20100909 (prerelease) (Debian 4.4.4-14)
(readline v6.1 enabled, extended help available)
Copyright (C) 2000-2006 The PARI Group
PARI/GP is free software, covered by the GNU General Public License, and
comes WITHOUT ANY WARRANTY WHATSOEVER.
Type ? for help, \q to quit.
Type ?12 for how to get moral (and possibly technical) support.
parisize = 4000000, primelimit = 500000
? for(i=2,1000,if(i!=ispower(2^i),print(i)))
?
No "i" was printed, this is correct. But I used a different gcc version and
./Configure decided to compile for "i686", not "i486"...
Best regards,
Marco Bodrato
-- System Information:
Debian Release: 5.0
APT prefers unstable
APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable')
Architecture: i386 (i686)
Kernel: Linux 2.6.29-tm290
Locale: LANG=en_US, LC_CTYPE=en_US (charmap=ISO-8859-1)
Shell: /bin/sh linked to /bin/bash
Versions of packages pari-gp depends on:
ii libc6 2.11.1-3 Embedded GNU C Library:
Shared lib
ii libpari2-gmp 2.3.4-1 PARI/GP Computer Algebra
System sh
ii libreadline6 6.1-3 GNU readline and history
libraries
ii libx11-6 2:1.2-1 X11 client-side library
pari-gp recommends no packages.
Versions of packages pari-gp suggests:
ii pari-doc 2.3.5-1 PARI/GP Computer Algebra
System do
ii pari-extra 2.1-1 PARI/GP Computer Algebra
System ex
pn pari-gp2c <none> (no description available)
-- no debconf information
--
http://bodrato.it/
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