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A136921
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Numbers n such that n and the square of n use only the digits 0, 2, 6 and 7.
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0
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0, 26, 260, 2600, 26000, 260000, 2600000, 26000000, 260000000, 2600000000, 26000000000, 260000000000, 2600000000000, 26000000000000, 260000000000000
(list; graph; refs; listen; history; internal format)
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