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.

A143417 Irregular triangle in which row n gives the k such that the reduced totient function psi(k) = A002174(n).

Table of values

n a(n)
1 1
2 2
3 3
4 4
5 6
6 8
7 12
8 24
9 5
10 10
11 15
12 16
13 20
14 30
15 40
16 48
17 60
18 80
19 120
20 240
21 7
22 9
23 14
24 18
25 21
26 28
27 36
28 42
29 56
30 63
31 72
32 84
33 126
34 168
35 252
36 504
37 32
38 96
39 160
40 480
41 11
42 22
43 33
44 44
45 66
46 88
47 132
48 264
49 13
50 26
51 35
52 39
53 45
54 52
55 65
56 70
57 78
58 90
59 91
60 104
61 105
62 112
63 117
64 130
65 140
66 144
67 156

List of values

[1, 2, 3, 4, 6, 8, 12, 24, 5, 10, 15, 16, 20, 30, 40, 48, 60, 80, 120, 240, 7, 9, 14, 18, 21, 28, 36, 42, 56, 63, 72, 84, 126, 168, 252, 504, 32, 96, 160, 480, 11, 22, 33, 44, 66, 88, 132, 264, 13, 26, 35, 39, 45, 52, 65, 70, 78, 90, 91, 104, 105, 112, 117, 130, 140, 144, 156]

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

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