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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.

A225243 Irregular triangle read by rows, where row n contains the distinct primes that are contained in the binary representation of n as substrings; first row = [1] by convention.

Table of values

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

List of values

[1, 2, 3, 2, 2, 5, 2, 3, 3, 7, 2, 2, 2, 5, 2, 3, 5, 11, 2, 3, 2, 3, 5, 13, 2, 3, 7, 3, 7, 2, 2, 17, 2, 2, 3, 19, 2, 5, 2, 5, 2, 3, 5, 11, 2, 3, 5, 7, 11, 23, 2, 3, 2, 3, 2, 3, 5, 13, 2, 3, 5, 11, 13, 2, 3, 7, 2, 3, 5, 7, 13, 29, 2, 3, 7, 3, 7, 31, 2, 2, 2, 17]

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