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.

A135347 An inverse of the unitary totient function A047994.

Table of values

n a(n)
1 1
2 3
3 4
4 5
5 -1
6 7
7 8
8 9
9 -1
10 11
11 -1
12 13
13 -1
14 24
15 16
16 17
17 -1
18 19
19 -1
20 33
21 -1
22 23
23 -1
24 25
25 -1
26 27
27 -1
28 29
29 -1
30 31
31 32
32 45
33 -1
34 -1
35 -1
36 37
37 -1
38 -1
39 -1
40 41
41 -1
42 43
43 -1
44 69
45 -1
46 47
47 -1
48 49
49 -1
50 -1
51 -1
52 53
53 -1
54 76
55 -1
56 72
57 -1
58 59
59 -1
60 61
61 -1
62 96
63 64
64 85
65 -1
66 67
67 -1
68 -1
69 -1
70 71
71 -1
72 73
73 -1
74 -1
75 -1
76 -1
77 -1
78 79
79 -1
80 81
81 -1
82 83
83 -1
84 104
85 -1
86 -1
87 -1

List of values

[1, 3, 4, 5, -1, 7, 8, 9, -1, 11, -1, 13, -1, 24, 16, 17, -1, 19, -1, 33, -1, 23, -1, 25, -1, 27, -1, 29, -1, 31, 32, 45, -1, -1, -1, 37, -1, -1, -1, 41, -1, 43, -1, 69, -1, 47, -1, 49, -1, -1, -1, 53, -1, 76, -1, 72, -1, 59, -1, 61, -1, 96, 64, 85, -1, 67, -1, -1, -1, 71, -1, 73, -1, -1, -1, -1, -1, 79, -1, 81, -1, 83, -1, 104, -1, -1, -1]