Divisor-Count

Number Theory #2-ex April 28, 2026 9 min read

Möbius Practice — LCM Sums, Divisor-Count, Omega Numbers

Practice problems for Möbius inversion: LCMSUM, two-variable lcm sum (O(n^3/4)), FSF’s game with offline difference, divisor-count sum d(ij), Omega Numbers with Dirichlet suffix sum.

#math #number-theory #mobius-inversion #lcm #divisor-count

#Divisor-Count

Möbius Practice — LCM Sums, Divisor-Count, Omega Numbers