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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.

A344140 a(n) = Sum_{x_1|n, x_2|n, ... , x_n|n} gcd(x_1,x_2, ... ,x_n).

Table of values

n a(n)
1 1
2 5
3 10
4 99
5 36
6 4290
7 134
8 72613
9 20713
10 1053700
11 2058
12 2194638822
13 8204
14 268550150
15 1073938440
16 156969213515
17 131088
18 101697785139535
19 524306
20 3657271905119820
21 4398063288332
22 17592232181770
23 8388630
24 4727105990672866963914
25 847422827191
26 4503600499785740

List of values

[1, 5, 10, 99, 36, 4290, 134, 72613, 20713, 1053700, 2058, 2194638822, 8204, 268550150, 1073938440, 156969213515, 131088, 101697785139535, 524306, 3657271905119820, 4398063288332, 17592232181770, 8388630, 4727105990672866963914, 847422827191, 4503600499785740]

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

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