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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.

A277097 a(n) = 5 - (prime(n) mod 10).

Table of values

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

List of values

[3, 2, 0, -2, 4, 2, -2, -4, 2, -4, 4, -2, 4, 2, -2, 2, -4, 4, -2, 4, 2, -4, 2, -4, -2, 4, 2, -2, -4, 2, -2, 4, -2, -4, -4, 4, -2, 2, -2, 2, -4, 4, 4, 2, -2, -4, 4, 2, -2, -4, 2, -4, 4, 4, -2, 2, -4, 4, -2, 4, 2, 2, -2, 4, 2, -2, 4, -2, -2, -4, 2]

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