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.

A197504 1 together with the odd numbers m >= 3 for which phi(2*m)/2 = phi(m)/2 is odd, where phi = A000010 (Euler's totient).

Table of values

n a(n)
1 1
2 3
3 7
4 9
5 11
6 19
7 23
8 27
9 31
10 43
11 47
12 49
13 59
14 67
15 71
16 79
17 81
18 83
19 103
20 107
21 121
22 127
23 131
24 139
25 151
26 163
27 167
28 179
29 191
30 199
31 211
32 223
33 227
34 239
35 243
36 251
37 263
38 271
39 283
40 307
41 311
42 331
43 343
44 347
45 359
46 361
47 367
48 379
49 383
50 419
51 431
52 439
53 443
54 463
55 467
56 479
57 487
58 491
59 499
60 503
61 523
62 529

List of values

[1, 3, 7, 9, 11, 19, 23, 27, 31, 43, 47, 49, 59, 67, 71, 79, 81, 83, 103, 107, 121, 127, 131, 139, 151, 163, 167, 179, 191, 199, 211, 223, 227, 239, 243, 251, 263, 271, 283, 307, 311, 331, 343, 347, 359, 361, 367, 379, 383, 419, 431, 439, 443, 463, 467, 479, 487, 491, 499, 503, 523, 529]

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

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