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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.

A373133 a(n) = Sum_{1 <= x_1, x_2, x_3 <= n} sigma( ( n/gcd(x_1, x_2, x_3, n) )^3 ).

Table of values

n a(n)
1 1
2 106
3 1041
4 7218
5 19345
6 110346
7 136801
8 465522
9 768327
10 2050570
11 1947121
12 7513938
13 5226481
14 14500906
15 20138145
16 29822066
17 25640641
18 81442662
19 49651921
20 139632210
21 142409841
22 206394826
23 154751521
24 484608402
25 302749845
26 554006986
27 560366223
28 987429618
29 616040881

List of values

[1, 106, 1041, 7218, 19345, 110346, 136801, 465522, 768327, 2050570, 1947121, 7513938, 5226481, 14500906, 20138145, 29822066, 25640641, 81442662, 49651921, 139632210, 142409841, 206394826, 154751521, 484608402, 302749845, 554006986, 560366223, 987429618, 616040881]

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

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