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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.

A385197 The number of integers k from 1 to n such that the greatest divisor of k that is a unitary divisor of n is a noncomposite number.

Table of values

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

List of values

[1, 2, 3, 3, 5, 5, 7, 7, 8, 9, 11, 9, 13, 13, 14, 15, 17, 16, 19, 15, 20, 21, 23, 21, 24, 25, 26, 21, 29, 22, 31, 31, 32, 33, 34, 24, 37, 37, 38, 35, 41, 32, 43, 33, 40, 45, 47, 45, 48, 48, 50, 39, 53, 52, 54, 49, 56, 57, 59, 42, 61, 61, 56, 63, 64, 52, 67, 51]

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

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