cp's OEIS Frontend

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.

A383268 Numbers k for which sigma(k - x) + sigma(k + x) = 4*k has at least one nonnegative solution.

Table of values

n a(n)
1 6
2 13
3 15
4 17
5 28
6 33
7 39
8 42
9 50
10 51
11 53
12 54
13 55
14 57
15 59
16 61
17 65
18 66
19 69
20 71
21 77
22 78
23 82
24 89
25 90
26 93
27 95
28 99
29 101
30 107
31 111
32 115
33 118
34 120
35 121
36 123
37 125
38 129
39 131
40 139
41 141
42 149
43 153
44 161
45 165
46 167
47 171
48 177
49 179
50 182
51 183
52 190
53 195
54 196
55 197
56 201
57 204
58 213
59 215

List of values

[6, 13, 15, 17, 28, 33, 39, 42, 50, 51, 53, 54, 55, 57, 59, 61, 65, 66, 69, 71, 77, 78, 82, 89, 90, 93, 95, 99, 101, 107, 111, 115, 118, 120, 121, 123, 125, 129, 131, 139, 141, 149, 153, 161, 165, 167, 171, 177, 179, 182, 183, 190, 195, 196, 197, 201, 204, 213, 215]

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

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