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