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

Offset

1,2

Links

Zhao Hui Du, Table of n, a(n) for n = 1..31

Patrick De Geest, Squares containing at most three distinct digits, Index entries for related sequences.

Hisanori Mishima, Sporadic tridigital solutions.

Formula

a(n) = A053910(n)^2. - Elmo R. Oliveira, Jul 16 2025

Crossrefs

Cf. A053910.

Sequence in context: A204268 A075373 A072470 * A171522 A236287 A329964

Adjacent sequences: A053908 A053909 A053910 * A053912 A053913 A053914

Keyword

nonn,base

Author

Patrick De Geest, Mar 15 2000

Status

approved