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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.

A226385 Numbers n such that rad(phi(n)) > phi(rad(n)), where rad(n) is the squarefree kernel of n, and phi is Euler's totient function.

Table of values

n a(n)
1 4
2 8
3 9
4 16
5 18
6 25
7 27
8 32
9 36
10 49
11 50
12 54
13 64
14 72
15 75
16 81
17 98
18 99
19 100
20 108
21 121
22 125
23 128
24 144
25 147
26 150
27 162
28 169
29 175
30 196
31 198
32 200
33 207
34 216
35 225
36 242
37 243
38 245
39 250
40 256
41 288
42 289
43 294
44 297
45 300
46 324
47 338
48 343
49 350
50 361
51 363
52 375
53 392
54 396
55 400
56 414

List of values

[4, 8, 9, 16, 18, 25, 27, 32, 36, 49, 50, 54, 64, 72, 75, 81, 98, 99, 100, 108, 121, 125, 128, 144, 147, 150, 162, 169, 175, 196, 198, 200, 207, 216, 225, 242, 243, 245, 250, 256, 288, 289, 294, 297, 300, 324, 338, 343, 350, 361, 363, 375, 392, 396, 400, 414]

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

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