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.

A088780 a(1) = 9, a(n) = smallest palindromic multiple of a(n-1) obtained by inserting digits anywhere in a(n-1).

Original entry on oeis.org

9, 99, 9009, 909909, 9009009009, 90099099099009, 90009090099009090009, 9000009009009009009009000009, 90000090099090099099099009099009000009
Offset: 1

Views

Author

Ray Chandler, Oct 26 2003

Keywords

Crossrefs

Cf. A082776, A082777, A082778, A082779, A082781, A082782, A082783.

Extensions

a(8) from David Consiglio, Jr., Sep 30 2022
a(9) from Max Alekseyev, Nov 24 2024

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

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