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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.

A300217 Numbers k such that tau(phi(k)) is a prime.

Table of values

n a(n)
1 3
2 4
3 5
4 6
5 8
6 10
7 12
8 17
9 32
10 34
11 40
12 48
13 60
14 85
15 128
16 136
17 160
18 170
19 192
20 204
21 240
22 1285
23 2048
24 2056
25 2176
26 2560
27 2570
28 2720
29 3072
30 3084
31 3264
32 3840
33 4080
34 4369
35 8192
36 8224
37 8704
38 8738
39 10240
40 10280
41 10880
42 12288
43 12336
44 13056
45 15360
46 15420
47 16320
48 65537

List of values

[3, 4, 5, 6, 8, 10, 12, 17, 32, 34, 40, 48, 60, 85, 128, 136, 160, 170, 192, 204, 240, 1285, 2048, 2056, 2176, 2560, 2570, 2720, 3072, 3084, 3264, 3840, 4080, 4369, 8192, 8224, 8704, 8738, 10240, 10280, 10880, 12288, 12336, 13056, 15360, 15420, 16320, 65537]

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

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