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A137143
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Numbers n such that n and the square of n use only the digits 4, 5, 7, 8 and 9.
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1
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7, 88, 888, 7588, 9878, 75888, 885888, 989878, 7479878, 7589457, 7745957, 9775457, 97748957, 744888978, 757944588, 945985457, 7475598878, 9948757588, 88757455957, 99977995478, 747595978788, 947878988978, 948445875888, 994477479878, 997494589457, 7588797959878, 8875584485457, 9475747457588, 9478895478788, 9745484895478
(list; graph; refs; listen; history; internal format)
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