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.

A043880 Numbers k such that 0 and 1 occur juxtaposed in the base-4 representation of k but not of k+1.

Table of values

n a(n)
1 4
2 20
3 33
4 36
5 49
6 52
7 84
8 97
9 100
10 113
11 116
12 129
13 135
14 148
15 161
16 164
17 177
18 180
19 193
20 199
21 212
22 225
23 228
24 241
25 244
26 340
27 353
28 356
29 369
30 372
31 385
32 391
33 404
34 417
35 420
36 433
37 436
38 449
39 455
40 468
41 481
42 484
43 497
44 500
45 513
46 519
47 543
48 545
49 548
50 561
51 564
52 596
53 609
54 612

List of values

[4, 20, 33, 36, 49, 52, 84, 97, 100, 113, 116, 129, 135, 148, 161, 164, 177, 180, 193, 199, 212, 225, 228, 241, 244, 340, 353, 356, 369, 372, 385, 391, 404, 417, 420, 433, 436, 449, 455, 468, 481, 484, 497, 500, 513, 519, 543, 545, 548, 561, 564, 596, 609, 612]