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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.

A303149 Group number of n-th element in the periodic table, or 0 if the element does not have a group number.

Table of values

n a(n)
1 1
2 18
3 1
4 2
5 13
6 14
7 15
8 16
9 17
10 18
11 1
12 2
13 13
14 14
15 15
16 16
17 17
18 18
19 1
20 2
21 3
22 4
23 5
24 6
25 7
26 8
27 9
28 10
29 11
30 12
31 13
32 14
33 15
34 16
35 17
36 18
37 1
38 2
39 3
40 4
41 5
42 6
43 7
44 8
45 9
46 10
47 11
48 12
49 13
50 14
51 15
52 16
53 17
54 18
55 1
56 2
57 3
58 0
59 0
60 0
61 0
62 0
63 0
64 0
65 0
66 0
67 0
68 0
69 0
70 0
71 0
72 4
73 5
74 6
75 7
76 8
77 9

List of values

[1, 18, 1, 2, 13, 14, 15, 16, 17, 18, 1, 2, 13, 14, 15, 16, 17, 18, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 1, 2, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 5, 6, 7, 8, 9]

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