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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.

A317443 a(n) = number of k with 1 <= k <= n-1 such that a(k) + a(n-k) is not squarefree.

Table of values

n a(n)
1 0
2 1
3 0
4 2
5 0
6 3
7 0
8 7
9 0
10 7
11 0
12 10
13 0
14 9
15 2
16 8
17 4
18 9
19 8
20 10
21 8
22 11
23 10
24 17
25 8
26 13
27 12
28 15
29 4
30 19
31 4
32 25
33 6
34 17
35 8
36 25
37 12
38 19
39 10
40 27
41 10
42 23
43 14
44 22
45 16
46 25
47 16
48 26
49 12
50 21
51 16
52 22
53 14
54 31
55 16
56 40
57 14
58 29
59 20
60 32
61 14
62 27
63 22
64 35
65 24
66 33
67 24
68 32
69 28
70 25
71 18

List of values

[0, 1, 0, 2, 0, 3, 0, 7, 0, 7, 0, 10, 0, 9, 2, 8, 4, 9, 8, 10, 8, 11, 10, 17, 8, 13, 12, 15, 4, 19, 4, 25, 6, 17, 8, 25, 12, 19, 10, 27, 10, 23, 14, 22, 16, 25, 16, 26, 12, 21, 16, 22, 14, 31, 16, 40, 14, 29, 20, 32, 14, 27, 22, 35, 24, 33, 24, 32, 28, 25, 18]

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

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