In order to go work on the exercise, you can pick up the number of digits in the integers concerned by this congruence relation:

5
6
8
10
12
15
20

Please take note that WIMS pages are interactively generated; they are not ordinary HTML files. They must be used interactively ONLINE. It is useless for you to gather them through a robot program.

- Description: find a prime for the base of a congruence relation. This is the main site of WIMS (WWW Interactive Multipurpose Server): interactive exercises, online calculators and plotters, mathematical recreation and games
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