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Mobius Function problems
Problem Name Online Judge Year Contest Difficulty Level
1 GCD Extreme Categories SPOJ 1
2 LCM Sum Categories SPOJ 1
3 Panoramix's Prediction Categories Codeforces Codeforces Beta Round #69 (Div. 2 Only) 1
4 Coprime Triples Categories CodeChef 1
5 Sky Code Categories Live Archive 2008 Europe - Southeastern 2
6 Expected Greatest Common Divisor Categories CodeChef 3
7 Adding Least Common Multiples Categories CodeChef 5
8 Unusual Sequences Categories Codeforces Codeforces Round #450 (Div. 2) 6
9 Mobius Multiplications Categories CodeChef 7
10 GCD Extreme (hard) Categories SPOJ 7