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64={1, 2,4, 16, 8, 32, 64}
100={1, 2, 4, 5, 25, 50,100}
140={1, 2, 4, 7, 20, 10, 14, 35, 70, 140}
180={1, 2, 3, 4, 6, 9, 10, 12, 15, 18, 20, 30, 45, 60, 90, 180}
M.c.d={2, 4}