A053911

Squares composed of digits {1,6,9}.

1, 9, 16, 169, 196, 961, 69169, 69696, 9696996, 16966161, 611919169, 6661661161, 696199996996, 1911961611169, 99191919116196, 116116119966961, 116696699999166169, 699666116199699961, 996111661161199969, 611961619961911196961, 1616161166196691196196, 9919969966699691196169

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