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A137029
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Numbers n such that n and the square of n use only the digits 1, 3, 4, 7 and 9.
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1
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1, 3, 7, 19479, 134143, 379143, 439479, 971479, 1199143, 37917979, 97339479, 199434143, 314917979, 413934143, 443979479, 974379143, 1191399143, 1979379143, 3799934143, 4439979479, 13943149479, 34317917979, 199949471479, 3119999114479, 3791347379143, 4139944979479, 4379419449479, 4447177949143, 9997174339479
(list; graph; refs; listen; history; internal format)
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