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sqrt(81180) = 284.9
So the next square is 285.
2852 = 81225 so need to add 45
1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180