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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.

A373135 a(n) = Sum_{1 <= x_1, x_2, x_3, x_4 <= n} sigma( ( n/gcd(x_1, x_2, x_3, x_4, n) )^4 ).

Table of values

n a(n)
1 1
2 466
3 9681
4 123106
5 487345
6 4511346
7 6722401
8 31576546
9 63779361
10 227102770
11 235777201
12 1191789186
13 883674961
14 3132638866
15 4717986945
16 8084578786
17 7411648321
18 29721182226
19 17926949521
20 59995093570
21 65079564081
22 109872175666
23 81870270241
24 305692541826

List of values

[1, 466, 9681, 123106, 487345, 4511346, 6722401, 31576546, 63779361, 227102770, 235777201, 1191789186, 883674961, 3132638866, 4717986945, 8084578786, 7411648321, 29721182226, 17926949521, 59995093570, 65079564081, 109872175666, 81870270241, 305692541826]

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

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