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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.

A133285 Indices of the centered 12-gonal numbers which are also 12-gonal number, or numbers X such that 120*X^2-120*X+36 is a square.

Table of values

n a(n)
1 1
2 12
3 253
4 5544
5 121705
6 2671956
7 58661317
8 1287877008
9 28274632849
10 620754045660
11 13628314371661
12 299202162130872
13 6568819252507513
14 144214821393034404
15 3166157251394249365
16 69511244709280451616

List of values

[1, 12, 253, 5544, 121705, 2671956, 58661317, 1287877008, 28274632849, 620754045660, 13628314371661, 299202162130872, 6568819252507513, 144214821393034404, 3166157251394249365, 69511244709280451616]

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

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