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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.

A130758 a(n) = n if n is not an odd prime number. Otherwise, a(n) = k, where k is the smallest integer such that n < 10^k.

Table of values

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

List of values

[0, 1, 2, 1, 4, 1, 6, 1, 8, 9, 10, 2, 12, 2, 14, 15, 16, 2, 18, 2, 20, 21, 22, 2, 24, 25, 26, 27, 28, 2, 30, 2, 32, 33, 34, 35, 36, 2, 38, 39, 40, 2, 42, 2, 44, 45, 46, 2, 48, 49, 50, 51, 52, 2, 54, 55, 56, 57, 58, 2, 60, 2, 62, 63, 64, 65, 66, 2, 68]

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

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