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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.

A234306 a(n) = n + 1 - d(2n), where d(n) is the number of divisors of n.

Table of values

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

List of values

[0, 0, 0, 1, 2, 1, 4, 4, 4, 5, 8, 5, 10, 9, 8, 11, 14, 10, 16, 13, 14, 17, 20, 15, 20, 21, 20, 21, 26, 19, 28, 26, 26, 29, 28, 25, 34, 33, 32, 31, 38, 31, 40, 37, 34, 41, 44, 37, 44, 42, 44, 45, 50, 43, 48, 47, 50, 53, 56, 45, 58, 57, 52, 57, 58, 55, 64, 61]

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

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