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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.

A115309 a(n) = if n<9 then n else 9*a(floor(n/9)) + 8 - n mod 9.

Table of values

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

List of values

[1, 2, 3, 4, 5, 6, 7, 8, 17, 16, 15, 14, 13, 12, 11, 10, 9, 26, 25, 24, 23, 22, 21, 20, 19, 18, 35, 34, 33, 32, 31, 30, 29, 28, 27, 44, 43, 42, 41, 40, 39, 38, 37, 36, 53, 52, 51, 50, 49, 48, 47, 46, 45, 62, 61, 60, 59, 58, 57, 56, 55, 54, 71, 70, 69, 68, 67, 66, 65, 64, 63, 80]

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

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