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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.

A166923 Digital root of prime(n)^2.

Table of values

n a(n)
1 4
2 9
3 7
4 4
5 4
6 7
7 1
8 1
9 7
10 4
11 7
12 1
13 7
14 4
15 4
16 1
17 7
18 4
19 7
20 1
21 1
22 4
23 4
24 1
25 4
26 4
27 7
28 1
29 1
30 7
31 1
32 7
33 4
34 7
35 7
36 4
37 7
38 1
39 7
40 4
41 1
42 1
43 4
44 7
45 1
46 1
47 7
48 4
49 4
50 7
51 1
52 7
53 4
54 1
55 7
56 4
57 1
58 1
59 4
60 4
61 7
62 7
63 1
64 7
65 4
66 4
67 4
68 7
69 7
70 4
71 4
72 1
73 4
74 7
75 1
76 7
77 4
78 1
79 7
80 7
81 7
82 4
83 1
84 1
85 4
86 4
87 1
88 4
89 4
90 7
91 1
92 4
93 1
94 7
95 7
96 1
97 7
98 1
99 1
100 1
101 4
102 1
103 7
104 4
105 7

List of values

[4, 9, 7, 4, 4, 7, 1, 1, 7, 4, 7, 1, 7, 4, 4, 1, 7, 4, 7, 1, 1, 4, 4, 1, 4, 4, 7, 1, 1, 7, 1, 7, 4, 7, 7, 4, 7, 1, 7, 4, 1, 1, 4, 7, 1, 1, 7, 4, 4, 7, 1, 7, 4, 1, 7, 4, 1, 1, 4, 4, 7, 7, 1, 7, 4, 4, 4, 7, 7, 4, 4, 1, 4, 7, 1, 7, 4, 1, 7, 7, 7, 4, 1, 1, 4, 4, 1, 4, 4, 7, 1, 4, 1, 7, 7, 1, 7, 1, 1, 1, 4, 1, 7, 4, 7]

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