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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.

A212647 a(n) = product of exponents in canonical prime factorization of A181800(n) (n-th powerful number that is the first integer of its prime signature); a(1) = 1 by convention.

Table of values

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

List of values

[1, 2, 3, 4, 5, 4, 6, 6, 7, 8, 9, 8, 10, 12, 9, 12, 15, 8, 10, 14, 16, 18, 12, 11, 16, 20, 21, 16, 12, 18, 24, 18, 24, 20, 25, 13, 20, 28, 24, 27, 24, 30, 14, 22, 32, 30, 27, 30, 28, 35, 32, 15, 24, 36, 36, 16, 36, 36, 33, 32, 40, 40, 16, 26, 40, 42, 24, 42, 45]

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

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