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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.

A168133 Numbers m = Sum_{k=1..n} sigma(k) such that Sum_{k=1..n} sigma(k) is divisible by k.

Table of values

n a(n)
1 1
2 4
3 56
4 99
5 238
6 3276
7 26820
8 55167
9 550514
10 3842258
11 16222973
12 56731455
13 118396264
14 396379039896
15 9772829297132
16 15876697439182
17 2710103706735457
18 4438313663247000
19 12136546505785858
20 3518811208764622050

List of values

[1, 4, 56, 99, 238, 3276, 26820, 55167, 550514, 3842258, 16222973, 56731455, 118396264, 396379039896, 9772829297132, 15876697439182, 2710103706735457, 4438313663247000, 12136546505785858, 3518811208764622050]

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

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