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.

A110175 Composite numbers n such that the equation phi(n)=phi(k)+phi(n-k) has no solution, where phi is Euler's totient function.

Table of values

n a(n)
1 6
2 30
3 49
4 81
5 91
6 95
7 115
8 121
9 155
10 187
11 205
12 210
13 221
14 243
15 254
16 259
17 287
18 298
19 299
20 329
21 341
22 355
23 361
24 377
25 403
26 415
27 437
28 451
29 469
30 473
31 502
32 533
33 551
34 559
35 565
36 611
37 625
38 629
39 649
40 655
41 662
42 667
43 674
44 679
45 685
46 703
47 713
48 731
49 737
50 746
51 767
52 779
53 781

List of values

[6, 30, 49, 81, 91, 95, 115, 121, 155, 187, 205, 210, 221, 243, 254, 259, 287, 298, 299, 329, 341, 355, 361, 377, 403, 415, 437, 451, 469, 473, 502, 533, 551, 559, 565, 611, 625, 629, 649, 655, 662, 667, 674, 679, 685, 703, 713, 731, 737, 746, 767, 779, 781]

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

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