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.

A109339 Number of letters in 2n (in Spanish).

Table of values

n a(n)
0 4
1 3
2 6
3 4
4 4
5 4
6 4
7 7
8 9
9 9
10 6
11 9
12 12
13 10
14 10
15 7
16 11
17 14
18 12
19 12
20 8
21 12
22 15
23 13
24 13
25 9
26 13
27 16
28 14
29 14
30 7
31 11
32 14
33 12
34 12
35 7
36 11
37 14
38 12
39 12
40 7
41 11
42 14
43 12
44 12
45 7
46 11
47 14
48 12
49 12
50 4
51 9
52 12
53 10
54 10
55 10
56 10
57 13
58 15
59 15
60 12
61 15
62 18
63 16
64 16
65 13
66 17
67 20
68 18
69 18
70 14
71 18
72 21
73 19
74 19
75 15

List of values

[4, 3, 6, 4, 4, 4, 4, 7, 9, 9, 6, 9, 12, 10, 10, 7, 11, 14, 12, 12, 8, 12, 15, 13, 13, 9, 13, 16, 14, 14, 7, 11, 14, 12, 12, 7, 11, 14, 12, 12, 7, 11, 14, 12, 12, 7, 11, 14, 12, 12, 4, 9, 12, 10, 10, 10, 10, 13, 15, 15, 12, 15, 18, 16, 16, 13, 17, 20, 18, 18, 14, 18, 21, 19, 19, 15]

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