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A137000
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Numbers n such that n and the square of n use only the digits 1, 2, 4, 8 and 9.
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1
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1, 2, 9, 11, 12, 21, 22, 29, 91, 122, 141, 212, 221, 222, 288, 441, 911, 921, 1118, 1191, 1488, 2212, 2988, 11141, 11882, 14829, 21212, 22229, 42921, 49441, 49829, 49891, 122182, 141118, 141421, 221911, 491141, 491212, 498891, 498928, 498941, 921911, 992421, 1114891, 1411428, 2211882, 2212288, 2981428, 2988118, 4911122, 4911428, 4921882
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