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Division with modulus remainders...

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Calculate discrete logarithm...

Restore a number from several its remainders (chinese remainder theorem)...

Getting a list of square-free numbers...

Finding perfect numbers (optimization)...

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Sieve of Eratosthenes: speeding up the "cross off multiples" step...

Remove duplicate during count in PARI GP...

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Is it possible to test whether a number is prime or not in O(logn)?...

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Euler function of C(n, k)...