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.

A339817 Squarefree numbers k > 1 for which the 2-adic valuation of phi(k) does not exceed the 2-adic valuation of k-1.

Table of values

n a(n)
1 2
2 3
3 5
4 7
5 11
6 13
7 17
8 19
9 21
10 23
11 29
12 31
13 33
14 37
15 41
16 43
17 47
18 53
19 57
20 59
21 61
22 65
23 67
24 69
25 71
26 73
27 77
28 79
29 83
30 89
31 93
32 97
33 101
34 103
35 107
36 109
37 113
38 127
39 129
40 131
41 133
42 137
43 139
44 141
45 145
46 149
47 151
48 157
49 161
50 163
51 167
52 173
53 177
54 179
55 181
56 191
57 193
58 197
59 199
60 201
61 209
62 211
63 213
64 217
65 223
66 227
67 229
68 233
69 237
70 239
71 241

List of values

[2, 3, 5, 7, 11, 13, 17, 19, 21, 23, 29, 31, 33, 37, 41, 43, 47, 53, 57, 59, 61, 65, 67, 69, 71, 73, 77, 79, 83, 89, 93, 97, 101, 103, 107, 109, 113, 127, 129, 131, 133, 137, 139, 141, 145, 149, 151, 157, 161, 163, 167, 173, 177, 179, 181, 191, 193, 197, 199, 201, 209, 211, 213, 217, 223, 227, 229, 233, 237, 239, 241]