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.

A306771 Numbers m such that m = i + j = i * k and phi(m) = phi(i) + phi(j) = phi(i) * phi(k) for some i, j, k, where phi is the Euler totient function A000010.

Table of values

n a(n)
1 3
2 15
3 21
4 33
5 39
6 51
7 57
8 69
9 75
10 87
11 93
12 105
13 111
14 123
15 129
16 141
17 147
18 159
19 165
20 177
21 183
22 195
23 201
24 213
25 219
26 231
27 237
28 249
29 255
30 267
31 273
32 285
33 291
34 303
35 309
36 321
37 327
38 339
39 345
40 357
41 363
42 375
43 381
44 393
45 399
46 411
47 417
48 429
49 435
50 447
51 453
52 465
53 471
54 483
55 489

List of values

[3, 15, 21, 33, 39, 51, 57, 69, 75, 87, 93, 105, 111, 123, 129, 141, 147, 159, 165, 177, 183, 195, 201, 213, 219, 231, 237, 249, 255, 267, 273, 285, 291, 303, 309, 321, 327, 339, 345, 357, 363, 375, 381, 393, 399, 411, 417, 429, 435, 447, 453, 465, 471, 483, 489]

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

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