DecInt is a class that support arithmetic on very large decimal integers. CHANGES Version 0.4 fixes a critical bug in version 0.3b. All users should upgrade! I have also created Windows binaries for GMPY that are specifically tuned for AMD 32-bit processors and the Intel Pentium 4 processors. These are experimental; I am not able to test them. WHAT DecInt can calculate the decimal form of the 42nd Mersenne prime, all 7,816,230 digits, in less than 21 seconds. And less than 6 seconds if gmpy 1.01 is available. Multiplication used a combination of 4-way Toom-Cook and Nussbaumer convolution. Pure Python multiplication is only 10x slower than GMP's hand optimised assembler code! Division uses a new algorithm based on David M. Smith's division algorithm. Pure Python division is 16x slower than GMP but can actually be faster in some instances; for example, dividing a 2,000,000 digit number by an 800,000 digit number. DecInt can be found at http://home.comcast.net/~casevh/ Enjoy, casevh