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.

A063770 Numbers k such that Sum_{j=1..k} sigma(j) divides Product_{j=1..k} phi(j).

Table of values

n a(n)
1 1
2 28
3 52
4 53
5 55
6 63
7 76
8 159
9 166
10 176
11 219
12 230
13 289
14 302
15 303
16 318
17 321
18 327
19 348
20 360
21 364
22 365
23 381
24 383
25 402
26 417
27 430
28 434
29 438
30 444
31 451
32 452
33 454
34 465
35 469
36 478
37 504
38 512
39 522
40 530
41 531
42 557
43 559
44 570
45 572
46 584
47 595
48 613
49 629
50 631
51 641
52 645
53 684

List of values

[1, 28, 52, 53, 55, 63, 76, 159, 166, 176, 219, 230, 289, 302, 303, 318, 321, 327, 348, 360, 364, 365, 381, 383, 402, 417, 430, 434, 438, 444, 451, 452, 454, 465, 469, 478, 504, 512, 522, 530, 531, 557, 559, 570, 572, 584, 595, 613, 629, 631, 641, 645, 684]