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A137071
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Numbers n such that n and the square of n use only the digits 2, 3, 4, 6 and 7.
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1
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2, 6, 26, 474, 4762, 272442, 273376, 2732632, 2764674, 27264326, 27337662, 47374332, 2724422442, 2724642442, 2763643326, 4727236262, 4737376662, 4737746644, 4772247662, 4772446262, 27247472662, 27326246426, 47246633344, 47362667432, 47377466632, 47673344474, 272463477632, 272623776426, 273363264674, 276337233762
(list; graph; refs; listen; history; internal format)
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