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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.

A164898 First differences of numbers having only odd digits in their decimal representation.

Table of values

n a(n)
1 2
2 2
3 2
4 2
5 2
6 2
7 2
8 2
9 2
10 12
11 2
12 2
13 2
14 2
15 12
16 2
17 2
18 2
19 2
20 12
21 2
22 2
23 2
24 2
25 12
26 2
27 2
28 2
29 2
30 12
31 2
32 2
33 2
34 2
35 12
36 2
37 2
38 2
39 2
40 12
41 2
42 2
43 2
44 2
45 12
46 2
47 2
48 2
49 2
50 12
51 2
52 2
53 2
54 2
55 112
56 2
57 2
58 2
59 2
60 12
61 2
62 2
63 2
64 2
65 12
66 2
67 2
68 2
69 2
70 12
71 2
72 2
73 2
74 2
75 12
76 2
77 2
78 2
79 2
80 112
81 2
82 2
83 2
84 2
85 12
86 2
87 2
88 2
89 2
90 12
91 2
92 2
93 2
94 2
95 12

List of values

[2, 2, 2, 2, 2, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12, 2, 2, 2, 2, 112, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12, 2, 2, 2, 2, 112, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12]

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