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A136958
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Numbers n such that n and the square of n use only the digits 0, 4, 7 and 8.
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0
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0, 88, 878, 880, 8780, 8800, 87800, 88000, 878000, 880000, 8780000, 8800000, 87800000, 88000000, 878000000, 880000000, 8780000000, 8800000000, 87800000000, 88000000000, 878000000000, 880000000000, 8780000000000, 8800000000000, 87800000000000, 88000000000000, 878000000000000, 880000000000000
(list; graph; refs; listen; history; internal format)
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