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.

A057826 Greatest number with totient 2n (or zero when no such number exists).

Table of values

n a(n)
1 6
2 12
3 18
4 30
5 22
6 42
7 0
8 60
9 54
10 66
11 46
12 90
13 0
14 58
15 62
16 120
17 0
18 126
19 0
20 150
21 98
22 138
23 94
24 210
25 0
26 106
27 162
28 174
29 118
30 198
31 0
32 240
33 134
34 0
35 142
36 270
37 0
38 0
39 158
40 330
41 166
42 294
43 0
44 276
45 0
46 282
47 0
48 420
49 0
50 250
51 206
52 318
53 214
54 378
55 242
56 348
57 0
58 354
59 0
60 462
61 0
62 0
63 254
64 510

List of values

[6, 12, 18, 30, 22, 42, 0, 60, 54, 66, 46, 90, 0, 58, 62, 120, 0, 126, 0, 150, 98, 138, 94, 210, 0, 106, 162, 174, 118, 198, 0, 240, 134, 0, 142, 270, 0, 0, 158, 330, 166, 294, 0, 276, 0, 282, 0, 420, 0, 250, 206, 318, 214, 378, 242, 348, 0, 354, 0, 462, 0, 0, 254, 510]

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

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