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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.

A064599 The sum of the nonunitary divisors of n is a divisor of n; i.e., sigma(n) - usigma(n) divides n.

Table of values

n a(n)
1 4
2 9
3 18
4 24
5 25
6 49
7 112
8 121
9 169
10 289
11 361
12 529
13 841
14 961
15 1369
16 1681
17 1849
18 1984
19 2209
20 2809
21 3481
22 3721
23 4489
24 5041
25 5329
26 6241
27 6889
28 7921
29 9409
30 10201
31 10609
32 11449
33 11881
34 12769
35 16129
36 17161
37 18769
38 19321
39 22201
40 22801
41 24649
42 26569

List of values

[4, 9, 18, 24, 25, 49, 112, 121, 169, 289, 361, 529, 841, 961, 1369, 1681, 1849, 1984, 2209, 2809, 3481, 3721, 4489, 5041, 5329, 6241, 6889, 7921, 9409, 10201, 10609, 11449, 11881, 12769, 16129, 17161, 18769, 19321, 22201, 22801, 24649, 26569]

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

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