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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.

A082655 Number of distinct letters needed to spell English names of numbers 1 through n.

Table of values

n a(n)
1 3
2 5
3 7
4 9
5 11
6 13
7 13
8 14
9 14
10 14
11 15
12 15
13 15
14 15
15 15
16 15
17 15
18 15
19 15
20 16
21 16
22 16
23 16
24 16
25 16
26 16
27 16
28 16
29 16
30 16
31 16
32 16
33 16
34 16
35 16
36 16
37 16
38 16
39 16
40 16
41 16
42 16
43 16
44 16
45 16
46 16
47 16
48 16
49 16
50 16
51 16
52 16
53 16
54 16
55 16
56 16
57 16
58 16
59 16
60 16
61 16
62 16
63 16
64 16
65 16
66 16

List of values

[3, 5, 7, 9, 11, 13, 13, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16]

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