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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.

A212642 a(n) = number of distinct prime signatures represented among divisors of A181800(n) (n-th powerful number that is the first integer of its prime signature).

Table of values

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

List of values

[1, 3, 4, 5, 6, 6, 7, 9, 8, 12, 10, 9, 15, 14, 10, 18, 18, 10, 11, 21, 15, 22, 16, 12, 24, 20, 26, 22, 13, 27, 25, 19, 30, 28, 21, 14, 30, 30, 28, 34, 34, 27, 15, 33, 35, 37, 20, 38, 40, 33, 31, 16, 36, 40, 46, 15, 28, 30, 42, 46, 39, 43, 17, 39, 45, 55, 25, 35]

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

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