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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.

A115305 a(n) = if n<5 then n else 5*a(floor(n/5)) + 4 - n mod 5.

Table of values

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

List of values

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

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

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