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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.

A053145 When cototient function (A051953) is iterated with initial value A002110(n), a(n) = number of iterations required to reach the stationary value=0.

Table of values

n a(n)
1 2
2 4
3 7
4 11
5 17
6 19
7 30
8 31
9 40
10 42
11 60
12 64
13 79
14 76
15 94
16 124
17 130
18 124
19 156
20 172
21 139
22 191
23 194
24 220
25 212
26 211
27 260
28 268
29 276
30 299
31 295
32 320
33 335
34 328
35 357
36 366
37 378
38 404
39 427
40 438
41 437
42 463
43 476
44 492
45 505
46 453
47 490
48 541
49 563
50 587
51 542
52 599
53 638
54 659

List of values

[2, 4, 7, 11, 17, 19, 30, 31, 40, 42, 60, 64, 79, 76, 94, 124, 130, 124, 156, 172, 139, 191, 194, 220, 212, 211, 260, 268, 276, 299, 295, 320, 335, 328, 357, 366, 378, 404, 427, 438, 437, 463, 476, 492, 505, 453, 490, 541, 563, 587, 542, 599, 638, 659]

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

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