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A053973
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Squares composed of digits {6,7,9}.
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2
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9, 676, 69696, 97969, 9696996, 9697699776769, 77797697969777769, 776797677679677696, 6776696769676669969, 9767769967769766976, 97667999767779769677969
(list; graph; refs; listen; history; internal format)
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