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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.

A239619 Base 3 sum of digits of prime(n).

Table of values

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

List of values

[2, 1, 3, 3, 3, 3, 5, 3, 5, 3, 3, 3, 5, 5, 5, 7, 5, 5, 5, 7, 5, 7, 3, 5, 5, 5, 5, 7, 3, 5, 5, 7, 5, 5, 7, 7, 7, 3, 5, 5, 7, 5, 5, 5, 7, 5, 7, 7, 7, 7, 9, 9, 9, 5, 5, 5, 7, 3, 5, 5, 5, 7, 5, 7, 7, 7, 5, 5, 7, 7, 5, 7, 7, 7, 5, 7, 7, 7, 9, 5, 7, 7, 9, 5, 7, 7, 9]

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