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- meissel lehmer
- summing multiplicative fns + prime counting with them
- counting permutation index with fenwick trees
- density: A perp {1, 2, 3}, etc
- translations of cubes problem
- fast sum of d(n) and circle prob (convex hull / stern brocot)
- sum of F(n)d(n)
- number of unlabeled trees on n nodes
- gamma reflection formula using lattice point counting
- density: A perp P