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.

A023742 Base 4 expansion uses each positive digit just once.

Table of values

n a(n)
1 27
2 30
3 39
4 45
5 54
6 57
7 75
8 78
9 99
10 108
11 114
12 120
13 135
14 141
15 147
16 156
17 177
18 180
19 198
20 201
21 210
22 216
23 225
24 228
25 267
26 270
27 291
28 300
29 306
30 312
31 387
32 396
33 432
34 450
35 456
36 480
37 519
38 525
39 531
40 540
41 561
42 564
43 579
44 588
45 624
46 705
47 708
48 720

List of values

[27, 30, 39, 45, 54, 57, 75, 78, 99, 108, 114, 120, 135, 141, 147, 156, 177, 180, 198, 201, 210, 216, 225, 228, 267, 270, 291, 300, 306, 312, 387, 396, 432, 450, 456, 480, 519, 525, 531, 540, 561, 564, 579, 588, 624, 705, 708, 720]