UBASIC is a extended version of
BASIC for doing exact arithmetic. This software is the work
of Yuri Kida of Kanazawa University
and is distributed free.You can download the program
by clicking on the link below.
The file is in zip format. You can use winzip to unzip it to your
hard drive. There are many sample
UBASIC programs in this zip file.
The UBASIC commands pertaining to Number Theory and some programs are provided in the link below.