cp's OEIS Frontend

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.

A372964 a(n) = Sum_{1 <= x_1, x_2, x_3, x_4 <= n} ( n/gcd(x_1, x_2, x_3, x_4, n) )^3.

Table of values

n a(n)
1 1
2 121
3 2161
4 15481
5 78001
6 261481
7 823201
8 1981561
9 4726081
10 9438121
11 19485841
12 33454441
13 62746321
14 99607321
15 168560161
16 253639801
17 410333761
18 571855801
19 893864881
20 1207533481
21 1778937361
22 2357786761
23 3404813281
24 4282153321
25 6093828001
26 7592304841
27 10335939121

List of values

[1, 121, 2161, 15481, 78001, 261481, 823201, 1981561, 4726081, 9438121, 19485841, 33454441, 62746321, 99607321, 168560161, 253639801, 410333761, 571855801, 893864881, 1207533481, 1778937361, 2357786761, 3404813281, 4282153321, 6093828001, 7592304841, 10335939121]

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

Content is available under The OEIS End-User License Agreement.