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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.

A230641 a(n) = n + (sum of digits in base-3 representation of n).

Table of values

n a(n)
0 0
1 2
2 4
3 4
4 6
5 8
6 8
7 10
8 12
9 10
10 12
11 14
12 14
13 16
14 18
15 18
16 20
17 22
18 20
19 22
20 24
21 24
22 26
23 28
24 28
25 30
26 32
27 28
28 30
29 32
30 32
31 34
32 36
33 36
34 38
35 40
36 38
37 40
38 42
39 42
40 44
41 46
42 46
43 48
44 50
45 48
46 50
47 52
48 52
49 54
50 56
51 56
52 58
53 60
54 56
55 58
56 60
57 60
58 62
59 64
60 64
61 66
62 68
63 66
64 68
65 70
66 70
67 72
68 74
69 74
70 76
71 78
72 76
73 78
74 80
75 80
76 82
77 84
78 84
79 86
80 88
81 82

List of values

[0, 2, 4, 4, 6, 8, 8, 10, 12, 10, 12, 14, 14, 16, 18, 18, 20, 22, 20, 22, 24, 24, 26, 28, 28, 30, 32, 28, 30, 32, 32, 34, 36, 36, 38, 40, 38, 40, 42, 42, 44, 46, 46, 48, 50, 48, 50, 52, 52, 54, 56, 56, 58, 60, 56, 58, 60, 60, 62, 64, 64, 66, 68, 66, 68, 70, 70, 72, 74, 74, 76, 78, 76, 78, 80, 80, 82, 84, 84, 86, 88, 82]

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

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