Wincalc for
Windows 95/98/ME/2K/XP/Vista (201K)
Click the above link to download the program. (21 Sep 08)
Page last updated: 30 Jun 09
Wincalc allows the user to calculate integers with millions of digits.
Some gigantic Mersenne primes
have already been calculated for you. (30 Jun 08)
There are a few additional large strings of digits here.
(2 Aug 06)
If the program behaves strangely, there is a page of
FAQ, which may help. If not, you can e-mail me at the address found in the program’s Help|About dialog box.
Follow the links for more information about the Windows 95/98/ME/2K/XP/Vista version or the Windows 3.1 version.
30 Jun 09: Calculated and uploaded the 47rd Mersenne prime
M42643801, to keep my library of examples up to date.
19 Nov 06: Discovered how to word-wrap my help texts. I await news of unintended
consequences.
2 Aug 06: Taught the parser to ignore non-digits when pasting a numerical text in
from the clipboard.
10 Jan 06: As expected, the 43rd Mersenne prime
M30402457 took almost two days to calculate.
8 Jan 06: I was horrified to discover, as I began the long
calculation of the recently announced 43rd Mersenne prime,
that the last few million digits of
my version of the 42nd Mersenne prime were incorrect! (It seems that I forgot that
it is necessary to add back the 1 when converting a Mersenne prime back to a
power of 2; I also forgot to check my work.) The current version of M25964951 has
been recalculated and checked. I hope to have M30402457 ready in a couple of days.
28 Dec 05: In response to users reporting difficulty opening files
by double-clicking file icons, new versions have been prepared that deal with
file-naming conventions that allow spaces (and extra periods).
See the FAQ.
2 Mar 05: The largest known
Mersenne primes
are now available for downloading as Wincalc files.
14 Feb 05: Saving a multi-page number as a text file is now done
automatically, instead of requiring a page-by-page approach (a vestige of Windows 3.1
limitations).
31 Jan 05: Minor corrections: The text windows (help files, notebooks,
tables, etc) were losing their carets (the blinking thing) now and then, and were not
opening files correctly.
15 Jan 05: It seems that the old “search” function that I installed years
ago in text windows no longer works under Windows XP, so I had to revise it.
23 Feb 04: At long last, I have finished
a new version of Wincalc. I await
suggestions and reports of bugs.
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