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.

A130670 Smallest k such that phi(x) = k has exactly n even solutions.

Table of values

n a(n)
1 1
2 2
3 4
4 8
5 16
6 32
7 24
8 80
9 48
10 160
11 72
12 216
13 96
14 792
15 360
16 144
17 192
18 1056
19 1512
20 1080
21 240
22 288
23 432
24 1248
25 3200
26 1200
27 768
28 3120
29 480
30 576
31 2496
32 720
33 1536
34 864
35 6000
36 3600
37 2016
38 3072
39 960
40 3168
41 3744
42 1152
43 11664
44 2688
45 2400
46 2160
47 9792
48 1728
49 6240
50 9072

List of values

[1, 2, 4, 8, 16, 32, 24, 80, 48, 160, 72, 216, 96, 792, 360, 144, 192, 1056, 1512, 1080, 240, 288, 432, 1248, 3200, 1200, 768, 3120, 480, 576, 2496, 720, 1536, 864, 6000, 3600, 2016, 3072, 960, 3168, 3744, 1152, 11664, 2688, 2400, 2160, 9792, 1728, 6240, 9072]

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

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