cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A053881 Squares composed of digits {1,2,4}.

Original entry on oeis.org

1, 4, 121, 144, 441, 1444, 114244, 2214144, 11142244, 121242121, 421111441, 1111422244, 44424414441, 111114222244, 11111142222244, 214222214414224, 242441124211441, 411244411422244, 1111111422222244, 2111211444222241
Offset: 1

Views

Author

Patrick De Geest, Mar 15 2000

Keywords

Comments

Includes all numbers of the form ((10^k-1)/3 + 5)^2 for k > 1. - Andrew Howroyd, Sep 28 2024

Examples

			Terms include 1444, 114244, 11142244, 1111422244, 111114222244, 11111142222244, etc. - _Andrew Howroyd_, Sep 28 2024
		

Crossrefs

Cf. A053880.

Formula

a(n) = A053880(n)^2.