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.

A260021 Solutions to phi(n) = phi(sigma(n)) that are not given by Theorem 3 of Golomb's manuscript.

Table of values

n a(n)
1 1
2 3
3 15
4 45
5 175
6 357
7 585
8 608
9 646
10 962
11 1071
12 1292
13 1443
14 1508
15 1586
16 1664
17 1665
18 1898
19 2275
20 2295
21 2379
22 2745
23 2847
24 3285
25 3848
26 4082
27 4329
28 4514
29 4641
30 4736
31 4845
32 5018
33 5402
34 6123
35 6232
36 6344
37 6475
38 6771
39 7052
40 7065
41 7137
42 7202
43 7215
44 7527
45 7592
46 7803
47 7808
48 8103
49 8138
50 8398
51 8541
52 8685
53 8906
54 9344
55 9526
56 10322

List of values

[1, 3, 15, 45, 175, 357, 585, 608, 646, 962, 1071, 1292, 1443, 1508, 1586, 1664, 1665, 1898, 2275, 2295, 2379, 2745, 2847, 3285, 3848, 4082, 4329, 4514, 4641, 4736, 4845, 5018, 5402, 6123, 6232, 6344, 6475, 6771, 7052, 7065, 7137, 7202, 7215, 7527, 7592, 7803, 7808, 8103, 8138, 8398, 8541, 8685, 8906, 9344, 9526, 10322]

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

Content is available under The OEIS End-User License Agreement.