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A137053
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Numbers k such that k and k^2 use only the digits 1, 4, 6, 7 and 9.
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1
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1, 4, 7, 14, 69, 119, 4119, 4446, 4469, 6479, 41469, 44469, 69114, 641619, 679479, 4116974, 4176974, 4179676, 4411479, 6416969, 6477974, 6646614, 6646764, 6691771, 6794446, 9719114, 41766969, 41794676, 41799479, 64169446, 66464119, 66679676, 67949796, 97466771, 99747176, 414476974, 441491469, 447179119, 679679676, 997496614
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