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Mobius Function problems
Problem Name Online Judge Year Contest Difficulty Level
1 LCM Sum Categories SPOJ 1
2 Coprime Triples Categories CodeChef 1
3 GCD Extreme Categories SPOJ 1
4 Sky Code Categories Live Archive 2008 Europe - Southeastern 2
5 Expected Greatest Common Divisor Categories CodeChef 3
6 Adding Least Common Multiples Categories CodeChef 5
7 Unusual Sequences Categories Codeforces Codeforces Round #450 (Div. 2) 6
8 Mobius Multiplications Categories CodeChef 7
9 GCD Extreme (hard) Categories SPOJ 7