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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.

A135210 Numbers n such that Sum_digits(n) + Sum_digits(n+1) = Sum_digits(2*n+1).

Table of values

n a(n)
1 0
2 1
3 2
4 3
5 4
6 9
7 10
8 11
9 12
10 13
11 14
12 19
13 20
14 21
15 22
16 23
17 24
18 29
19 30
20 31
21 32
22 33
23 34
24 39
25 40
26 41
27 42
28 43
29 44
30 49
31 99
32 100
33 101
34 102
35 103
36 104
37 109
38 110
39 111
40 112
41 113
42 114
43 119
44 120
45 121
46 122
47 123
48 124
49 129
50 130
51 131
52 132
53 133
54 134
55 139
56 140
57 141
58 142
59 143
60 144
61 149

List of values

[0, 1, 2, 3, 4, 9, 10, 11, 12, 13, 14, 19, 20, 21, 22, 23, 24, 29, 30, 31, 32, 33, 34, 39, 40, 41, 42, 43, 44, 49, 99, 100, 101, 102, 103, 104, 109, 110, 111, 112, 113, 114, 119, 120, 121, 122, 123, 124, 129, 130, 131, 132, 133, 134, 139, 140, 141, 142, 143, 144, 149]

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

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