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A084006
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Squares arising as a concatenation of k and 9's complement of k.
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5
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36, 81, 1089, 4356, 9801, 110889, 443556, 998001, 11108889, 44435556, 99980001, 1111088889, 4444355556, 9999800001, 111110888889, 444443555556, 999998000001, 11111108888889, 44444435555556, 99999980000001
(list; graph; refs; listen; history; internal format)
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