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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.

A128826 a(n) = 10^(2n-1) minus largest square less than 10^(2n-1).

Table of values

n a(n)
1 1
2 39
3 144
4 1756
5 49116
6 484471
7 4175271
8 38053824
9 10649244
10 1064924400
11 43246886799
12 529955487744
13 2399106211776
14 50173961567511
15 590207432515431
16 2099745368512359
17 20237877241133151
18 126421128012287511

List of values

[1, 39, 144, 1756, 49116, 484471, 4175271, 38053824, 10649244, 1064924400, 43246886799, 529955487744, 2399106211776, 50173961567511, 590207432515431, 2099745368512359, 20237877241133151, 126421128012287511]

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

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