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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.

A372950 a(n) = Sum_{1 <= x_1, x_2 <= n} ( n/gcd(x_1, x_2, n) )^3.

Table of values

n a(n)
1 1
2 25
3 217
4 793
5 3001
6 5425
7 16465
8 25369
9 52705
10 75025
11 159721
12 172081
13 369097
14 411625
15 651217
16 811801
17 1414945
18 1317625
19 2469241
20 2379793
21 3572905
22 3993025
23 6424177
24 5505073
25 9378001
26 9227425
27 12807289
28 13056745
29 20486761
30 16280425
31 28599361
32 25977625
33 34659457

List of values

[1, 25, 217, 793, 3001, 5425, 16465, 25369, 52705, 75025, 159721, 172081, 369097, 411625, 651217, 811801, 1414945, 1317625, 2469241, 2379793, 3572905, 3993025, 6424177, 5505073, 9378001, 9227425, 12807289, 13056745, 20486761, 16280425, 28599361, 25977625, 34659457]

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

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