1 The No.1 ugly number is 1.
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2 The No.2 ugly number is 2.
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3 The No.4 ugly number is 4.
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4 The No.7 ugly number is 8.
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5 The No.10 ugly number is 12.
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6 The No.16 ugly number is 25.
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7 The No.75 ugly number is 675.
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8 The No.85 ugly number is 972.
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9 The No.150 ugly number is 5832.
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