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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.

A281854 Irregular triangle read by rows. Row n gives the orders of the cyclic groups appearing as factors in the direct product decomposition of the abelian non-cyclic multiplicative groups of integers modulo A033949(n).

Table of values

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

List of values

[2, 2, 2, 2, 4, 2, 4, 2, 4, 2, 3, 2, 2, 2, 2, 2, 3, 2, 2, 4, 2, 8, 2, 5, 2, 2, 4, 3, 2, 3, 2, 2, 4, 3, 2, 4, 2, 2, 3, 2, 2, 5, 2, 2, 4, 3, 2, 4, 2, 2, 16, 2, 4, 3, 2, 5, 4, 2, 3, 2, 2, 2, 9, 2, 2, 4, 2, 2]

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

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