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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.

A280181 Indices of centered 9-gonal numbers (A060544) that are also squares (A000290).

Table of values

n a(n)
1 1
2 17
3 561
4 19041
5 646817
6 21972721
7 746425681
8 25356500417
9 861374588481
10 29261379507921
11 994025528680817
12 33767606595639841
13 1147104598723073761
14 38967788749988868017
15 1323757712900898438801
16 44968794449880558051201
17 1527615253583038075302017

List of values

[1, 17, 561, 19041, 646817, 21972721, 746425681, 25356500417, 861374588481, 29261379507921, 994025528680817, 33767606595639841, 1147104598723073761, 38967788749988868017, 1323757712900898438801, 44968794449880558051201, 1527615253583038075302017]

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

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