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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.

A199919 Number of distinct sums of distinct divisors of n when positive and negative divisors are allowed.

Table of values

n a(n)
1 3
2 7
3 9
4 15
5 9
6 25
7 9
8 31
9 27
10 37
11 9
12 57
13 9
14 49
15 49
16 63
17 9
18 79
19 9
20 85
21 65
22 49
23 9
24 121
25 27
26 49
27 81
28 113
29 9
30 145
31 9
32 127
33 81
34 49
35 69
36 183
37 9
38 49
39 81
40 181
41 9
42 193
43 9
44 169
45 157
46 49
47 9
48 249
49 27
50 187
51 81
52 197
53 9
54 241
55 69
56 241
57 81
58 49
59 9
60 337
61 9
62 49
63 209
64 255
65 81
66 289

List of values

[3, 7, 9, 15, 9, 25, 9, 31, 27, 37, 9, 57, 9, 49, 49, 63, 9, 79, 9, 85, 65, 49, 9, 121, 27, 49, 81, 113, 9, 145, 9, 127, 81, 49, 69, 183, 9, 49, 81, 181, 9, 193, 9, 169, 157, 49, 9, 249, 27, 187, 81, 197, 9, 241, 69, 241, 81, 49, 9, 337, 9, 49, 209, 255, 81, 289]

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

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