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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.

A385132 The number of integers k from 1 to n such that gcd(n, k) has an even maximum exponent in its prime factorization.

Table of values

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

List of values

[1, 1, 2, 3, 4, 2, 6, 5, 7, 4, 10, 7, 12, 6, 8, 11, 16, 8, 18, 13, 12, 10, 22, 11, 21, 12, 20, 19, 28, 8, 30, 21, 20, 16, 24, 24, 36, 18, 24, 21, 40, 12, 42, 31, 29, 22, 46, 25, 43, 22, 32, 37, 52, 22, 40, 31, 36, 28, 58, 31, 60, 30, 43, 43, 48, 20, 66, 49, 44]

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

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