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.

A384050 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 powerful number.

Table of values

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

List of values

[1, 1, 2, 4, 4, 2, 6, 8, 9, 4, 10, 8, 12, 6, 8, 16, 16, 9, 18, 16, 12, 10, 22, 16, 25, 12, 27, 24, 28, 8, 30, 32, 20, 16, 24, 36, 36, 18, 24, 32, 40, 12, 42, 40, 36, 22, 46, 32, 49, 25, 32, 48, 52, 27, 40, 48, 36, 28, 58, 32, 60, 30, 54, 64, 48, 20, 66, 64, 44]

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

Content is available under The OEIS End-User License Agreement.