Tricki

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- To establish that n is composite, show that Fermat's little theorem does not hold for n
- To factorize n, find a non-trivial square root of 1 mod n
- To find a factor of n, find some m such that (m,n) is not 1
- To find a rational with low denominator near a given real, use continued fractions
- To prove that a number is irrational, show that it is almost rational
- To work out powers mod n, use repeated squaring

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