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A137075
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Numbers n such that n and the square of n use only the digits 2, 3, 4, 7 and 9.
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1
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2, 3, 7, 27, 223, 473, 4943, 49777, 222327, 273393, 477277, 499423, 499473, 973393, 2733943, 4932923, 4993443, 4994777, 4997927, 49342927, 49924277, 49972927, 49993443, 49994223, 49994777, 97339223, 492942927, 494342927, 497332327, 497794473, 497993923, 499293443, 499932923, 499947327, 499972927, 499979277, 499979327
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