GNU bug report logs - #15626
calc prime test fails for numbers > 8 million

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Package: emacs;

Reported by: Glenn Morris <rgm <at> gnu.org>

Date: Wed, 16 Oct 2013 00:33:02 UTC

Severity: normal

Found in version 24.3

Done: Jay Belanger <jay.p.belanger <at> gmail.com>

Bug is archived. No further changes may be made.

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From: Glenn Morris <rgm <at> gnu.org>
To: 15626 <at> debbugs.gnu.org
Cc: Jay Belanger <jay.p.belanger <at> gmail.com>
Subject: bug#15626: calc prime test fails for numbers > 8 million
Date: Tue, 15 Oct 2013 20:32:15 -0400

Package: emacs
Version: 24.3

On x86_64 GNU/Linux:

emacs -Q -f calc
8000000 RET
k p
  -> Wrong type argument: listp, 8000000

Any number >= 8000000 (but < math-small-integer-size) fails in this way.

The problem is the

  (% (nth 1 n) 2) 0)

of math-prime-test, which still expects numbers larger than 8000000 to
be in (bigpos ... ) list format, but the limit is much greater than that
these days.

The calc manual is likewise outdated:

  19.5.7.1 Data Type Formats
  [...]
  Large integers are stored as lists of the form `(bigpos D0 D1 D2 ...)'
  for positive integers 1000000 or more,

(First reported at
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=679753 )
This bug report was last modified 11 years and 224 days ago.

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