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IDDescription / TitleSolved By
634Numbers of the form $a^2b^3$
161
633Square prime factors II
150
632Square prime factors
185
631Constrained Permutations
111
630Crossed lines
357
629Scatterstone Nim
135
628Open chess positions
338
627Counting products
148
626Counting Binary Matrices
140
625Gcd sum
280