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.

A218399 Triangular numbers composed of digits {0,4,7}.

Original entry on oeis.org

40470, 4744740, 4770740040, 44747000047470770470774700707404004740
Offset: 1

Views

Author

Max Alekseyev, Oct 28 2012

Keywords

Comments

a(5) > 10^40.

Links

Crossrefs

Cf. A000217, A218400. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A218400(n)).

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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