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.

A218401 Triangular numbers composed of digits {0,7,9}.

Original entry on oeis.org

990, 90779090007770790, 79909779970709079970099779979097777700
Offset: 1

Views

Author

Max Alekseyev, Oct 28 2012

Keywords

Comments

a(4) > 10^40.

Links

Crossrefs

Cf. A000217, A218402. See A119033 for a table of cross-references.

Formula

a(n) = A000217(A218402(n)).

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

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