cp's OEIS Frontend

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.

A368677 Number of numbers k less than n and not dividing n such that n-k is squarefree.

Table of values

n a(n)
1 0
2 0
3 1
4 1
5 3
6 2
7 4
8 4
9 5
10 5
11 6
12 5
13 8
14 7
15 8
16 9
17 11
18 10
19 12
20 10
21 12
22 12
23 14
24 13
25 16
26 15
27 16
28 14
29 17
30 16
31 18
32 18
33 18
34 19
35 20
36 19
37 23
38 22
39 23
40 22
41 26
42 23
43 27
44 25
45 27
46 28
47 29
48 28
49 30
50 31
51 30
52 29
53 32
54 31
55 33
56 32
57 33
58 33
59 35
60 32
61 37
62 36
63 37
64 38
65 39
66 37
67 40
68 38
69 40
70 40

List of values

[0, 0, 1, 1, 3, 2, 4, 4, 5, 5, 6, 5, 8, 7, 8, 9, 11, 10, 12, 10, 12, 12, 14, 13, 16, 15, 16, 14, 17, 16, 18, 18, 18, 19, 20, 19, 23, 22, 23, 22, 26, 23, 27, 25, 27, 28, 29, 28, 30, 31, 30, 29, 32, 31, 33, 32, 33, 33, 35, 32, 37, 36, 37, 38, 39, 37, 40, 38, 40, 40]

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

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