Modular C(n,r)

medium Extended Euclidean Algorithm medium Linear Diophantine Equation hard Eulers Totient Function medium Wilsons Theorem medium Modular Fast Exponentiation hard No Max No Min medium Prime Factors Using Sieve medium All Factors Using Sieve easy Count Of Common Divisors medium Gcd Length medium I Hate 1111 medium Relatively Prime Pairs medium Sum Of Factors easy Chinese Remainder Theorem easy Monkey Tradition