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.

A280593 Natural numbers whose digits can be formed by typing adjacent keys on a 123-456-789 keypad without repeating a digit.

Table of values

n a(n)
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
10 12
11 14
12 21
13 23
14 25
15 32
16 36
17 41
18 45
19 47
20 52
21 54
22 56
23 58
24 63
25 65
26 69
27 74
28 78
29 85
30 87
31 89
32 96
33 98
34 123
35 125
36 145
37 147
38 214
39 236
40 254
41 256
42 258
43 321
44 325
45 365
46 369
47 412
48 452
49 456
50 458
51 478
52 521
53 523
54 541
55 547
56 563
57 569
58 587
59 589
60 632
61 652
62 654
63 658
64 698
65 741
66 745
67 785
68 789

List of values

[1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 14, 21, 23, 25, 32, 36, 41, 45, 47, 52, 54, 56, 58, 63, 65, 69, 74, 78, 85, 87, 89, 96, 98, 123, 125, 145, 147, 214, 236, 254, 256, 258, 321, 325, 365, 369, 412, 452, 456, 458, 478, 521, 523, 541, 547, 563, 569, 587, 589, 632, 652, 654, 658, 698, 741, 745, 785, 789]