A053883 Squares composed of digits {1,2,6}.

1, 16, 121, 2116, 261121, 2621161, 6222212161, 6626611216, 6661661161, 26166621121, 1221126662116, 2121112611216, 21122122166161, 662612612216121616, 16611262122666122666161, 12626261111222162126111612161, 2221262216626122626662262611111116211216, 2662116111222626216162621266666216222222216621166116

Offset

1,2

Links

Table of n, a(n) for n=1..18.

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

Hisanori Mishima, Sporadic tridigital solutions.

Formula

a(n) = A053882(n)^2. - Elmo R. Oliveira, Jul 18 2025

Crossrefs

Cf. A053882.

Sequence in context: A069667 A104265 A068880 * A191484 A030508 A006215

Adjacent sequences: A053880 A053881 A053882 * A053884 A053885 A053886

Keyword

nonn,base

Author

Patrick De Geest, Mar 15 2000

Extensions

More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 04 2005

a(18) from Zhao Hui Du, Feb 28 2024

Status

approved