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A136957
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Numbers n such that n and the square of n use only the digits 0, 4, 6 and 9.
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0
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0, 64, 640, 6400, 64000, 640000, 6400000, 64000000, 640000000, 6400000000, 64000000000, 640000000000, 6400000000000, 64000000000000, 640000000000000
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