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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.

A049820 a(n) = n - d(n), where d(n) is the number of divisors of n (A000005).

Table of values

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

List of values

[0, 0, 1, 1, 3, 2, 5, 4, 6, 6, 9, 6, 11, 10, 11, 11, 15, 12, 17, 14, 17, 18, 21, 16, 22, 22, 23, 22, 27, 22, 29, 26, 29, 30, 31, 27, 35, 34, 35, 32, 39, 34, 41, 38, 39, 42, 45, 38, 46, 44, 47, 46, 51, 46, 51, 48, 53, 54, 57, 48, 59, 58, 57, 57, 61, 58, 65]

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

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