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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.

A256304 Apply the transformation 0 -> 1 -> 2 -> 3 -> 0 to the digits of n written in base 4; do not convert back to base 10.

Table of values

n a(n)
0 1
1 2
2 3
3 0
4 21
5 22
6 23
7 20
8 31
9 32
10 33
11 30
12 1
13 2
14 3
15 0
16 211
17 212
18 213
19 210
20 221
21 222
22 223
23 220
24 231
25 232
26 233
27 230
28 201
29 202
30 203
31 200
32 311
33 312
34 313
35 310
36 321
37 322
38 323
39 320
40 331
41 332
42 333
43 330
44 301
45 302
46 303
47 300
48 11
49 12
50 13
51 10
52 21
53 22
54 23
55 20
56 31
57 32

List of values

[1, 2, 3, 0, 21, 22, 23, 20, 31, 32, 33, 30, 1, 2, 3, 0, 211, 212, 213, 210, 221, 222, 223, 220, 231, 232, 233, 230, 201, 202, 203, 200, 311, 312, 313, 310, 321, 322, 323, 320, 331, 332, 333, 330, 301, 302, 303, 300, 11, 12, 13, 10, 21, 22, 23, 20, 31, 32]

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

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