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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.

A377758 a(n) is the least i such that 2n-prime(i) is also a prime, where prime(i) is the i-th prime.

Table of values

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

List of values

[1, 2, 2, 2, 3, 2, 2, 3, 2, 2, 3, 2, 3, 4, 2, 2, 3, 4, 2, 3, 2, 2, 3, 2, 3, 4, 2, 3, 4, 2, 2, 3, 4, 2, 3, 2, 2, 3, 4, 2, 3, 2, 3, 4, 2, 3, 4, 8, 2, 3, 2, 2, 3, 2, 2, 3, 2, 3, 4, 6, 5, 6, 8, 2, 3, 2, 3, 4, 2, 2, 3, 4, 5, 5, 2, 2, 3, 4, 2, 3, 4, 2, 3, 2, 3]

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