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

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- Description: find a prime for the base of a congruence relation. interactive exercises, online calculators and plotters, mathematical recreation and games
- Keywords: interactive mathematics, interactive math, server side interactivity, algebra, arithmetic, number_theory, congruence, factorization, primes, modular_arithmetic