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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.

A051445 Smallest k such that phi(k) = 2n, or 0 if there is no such k.

Table of values

n a(n)
1 3
2 5
3 7
4 15
5 11
6 13
7 0
8 17
9 19
10 25
11 23
12 35
13 0
14 29
15 31
16 51
17 0
18 37
19 0
20 41
21 43
22 69
23 47
24 65
25 0
26 53
27 81
28 87
29 59
30 61
31 0
32 85
33 67
34 0
35 71
36 73
37 0
38 0
39 79
40 123
41 83
42 129
43 0
44 89
45 0
46 141
47 0
48 97
49 0
50 101
51 103
52 159
53 107
54 109
55 121
56 113
57 0
58 177
59 0
60 143
61 0
62 0
63 127
64 255
65 131
66 161
67 0
68 137

List of values

[3, 5, 7, 15, 11, 13, 0, 17, 19, 25, 23, 35, 0, 29, 31, 51, 0, 37, 0, 41, 43, 69, 47, 65, 0, 53, 81, 87, 59, 61, 0, 85, 67, 0, 71, 73, 0, 0, 79, 123, 83, 129, 0, 89, 0, 141, 0, 97, 0, 101, 103, 159, 107, 109, 121, 113, 0, 177, 0, 143, 0, 0, 127, 255, 131, 161, 0, 137]

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

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