A027676 Squares composed of digits {1,4,6}.

1, 4, 16, 64, 144, 441, 1444, 11664, 14161, 14641, 16641, 41616, 166464, 646416, 6441444, 11614464, 44116164, 166616464, 664144441, 6114614416, 6661661161, 111461164164, 41616166464166464, 446444416444461444, 661161464116616164, 16146614646614661444, 144164464644611144644

Offset: 1

Author

Patrick De Geest

Keywords

• nonn
• base

Links

• Zhao Hui Du, Table of n, a(n) for n = 1..47
• Patrick De Geest, Squares containing at most three distinct digits, Index entries for related sequences.
• Patrick De Geest, Palindromic Squares in bases 2 to 17.
• Hisanori Mishima, Sporadic tridigital solutions.
• A. Ottens, The arithmetic-digits-squares-three.digits problem.
• Eric Weisstein's World of Mathematics, Square Number.

Crossrefs

Cf. A027677.

Formula

a(n) = A027677(n)^2. - Elmo R. Oliveira, Jul 16 2025