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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.

A100721 a(n) = n - a(a(a(a(a(a(n-1)))))), a(0)=0.

Table of values

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

List of values

[0, 1, 1, 2, 3, 4, 5, 6, 7, 7, 8, 8, 9, 10, 10, 11, 12, 13, 13, 14, 15, 16, 17, 17, 18, 19, 20, 21, 22, 22, 23, 24, 25, 26, 27, 28, 28, 29, 30, 31, 32, 33, 34, 34, 35, 35, 36, 37, 38, 39, 40, 41, 41, 42, 42, 43, 44, 44, 45, 46, 47, 48, 49, 50, 50, 51, 51, 52, 53, 53, 54, 55, 56, 56, 57, 58, 59]

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

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