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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.

A270828 a(n) = (Sum_{k=1..2n-1} prime(k)) mod prime(n).

Table of values

n a(n)
1 0
2 1
3 3
4 2
5 1
6 4
7 0
8 5
9 3
10 17
11 30
12 23
13 35
14 17
15 23
16 24
17 41
18 19
19 38
20 3
21 54
22 4
23 44
24 77
25 38
26 98
27 62
28 25
29 3
30 73
31 108
32 67
33 27
34 124
35 108
36 66
37 34
38 4
39 130
40 102
41 80
42 40
43 32
44 169
45 132
46 78
47 79
48 128
49 75
50 5
51 215
52 227
53 189
54 243
55 255
56 259
57 261
58 193
59 197
60 162
61 98
62 148
63 9
64 281
65 213
66 194
67 87
68 109
69 261
70 171

List of values

[0, 1, 3, 2, 1, 4, 0, 5, 3, 17, 30, 23, 35, 17, 23, 24, 41, 19, 38, 3, 54, 4, 44, 77, 38, 98, 62, 25, 3, 73, 108, 67, 27, 124, 108, 66, 34, 4, 130, 102, 80, 40, 32, 169, 132, 78, 79, 128, 75, 5, 215, 227, 189, 243, 255, 259, 261, 193, 197, 162, 98, 148, 9, 281, 213, 194, 87, 109, 261, 171]