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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.

A243351 Difference between 2n and the n-th squarefree number: a(n) = 2n - A005117(n).

Table of values

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

List of values

[1, 2, 3, 3, 4, 5, 4, 5, 5, 6, 7, 7, 7, 7, 8, 9, 8, 7, 8, 9, 9, 10, 11, 11, 12, 13, 13, 14, 15, 14, 15, 13, 13, 13, 13, 14, 15, 15, 16, 15, 16, 17, 17, 18, 19, 19, 20, 19, 20, 21, 20, 21, 21, 22, 23, 23, 23, 23, 24, 25, 25, 23, 24, 25, 25, 26, 27, 27, 28, 29, 29, 30]

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