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.

A330701 Numbers k such that psi(phi(k)) = 2 * phi(psi(k)), where psi(k) is the Dedekind psi function (A001615) and phi(k) is the Euler totient function (A000010).

Table of values

n a(n)
1 26
2 39
3 45
4 51
5 52
6 58
7 74
8 82
9 98
10 104
11 111
12 116
13 135
14 142
15 146
16 147
17 148
18 164
19 178
20 195
21 196
22 208
23 219
24 232
25 284
26 286
27 292
28 296
29 328
30 356
31 357
32 386
33 392
34 405
35 406
36 416
37 435
38 464
39 495
40 555
41 561
42 568
43 572
44 574
45 579
46 584
47 585
48 592
49 598
50 615
51 622
52 638
53 646
54 650

List of values

[26, 39, 45, 51, 52, 58, 74, 82, 98, 104, 111, 116, 135, 142, 146, 147, 148, 164, 178, 195, 196, 208, 219, 232, 284, 286, 292, 296, 328, 356, 357, 386, 392, 405, 406, 416, 435, 464, 495, 555, 561, 568, 572, 574, 579, 584, 585, 592, 598, 615, 622, 638, 646, 650]

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

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