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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.

A372962 a(n) = Sum_{1 <= x_1, x_2, x_3 <= n} ( n/gcd(x_1, x_2, x_3, n) )^2.

Table of values

n a(n)
1 1
2 29
3 235
4 925
5 3101
6 6815
7 16759
8 29597
9 57097
10 89929
11 160931
12 217375
13 371125
14 486011
15 728735
16 947101
17 1419569
18 1655813
19 2475739
20 2868425
21 3938365
22 4666999
23 6435815
24 6955295
25 9690601
26 10762625
27 13874563
28 15502075
29 20510309
30 21133315
31 28628191
32 30307229
33 37818785

List of values

[1, 29, 235, 925, 3101, 6815, 16759, 29597, 57097, 89929, 160931, 217375, 371125, 486011, 728735, 947101, 1419569, 1655813, 2475739, 2868425, 3938365, 4666999, 6435815, 6955295, 9690601, 10762625, 13874563, 15502075, 20510309, 21133315, 28628191, 30307229, 37818785]

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

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