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A137009
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Numbers n such that n and the square of n use only the digits 1, 2, 5, 7 and 9.
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1
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1, 5, 11, 15, 27, 77, 227, 527, 715, 1515, 1711, 2777, 7227, 7715, 22715, 52915, 71911, 97527, 159911, 275527, 277977, 715511, 727511, 977511, 2791515, 7219777, 7557511, 7715515, 7727711, 7727715, 9591515, 9777515, 9797511, 9797715, 9955511, 11292915, 12292915, 17255515, 27771527, 27797715, 27797977, 27915515, 71971911, 72299211
(list; graph; refs; listen; history; internal format)
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