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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.

A317595 a(n) is the number of primes between 2n and the largest prime p such that 2n-p is also a prime.

Table of values

n a(n)
2 1
3 1
4 1
5 0
6 1
7 1
8 0
9 1
10 1
11 0
12 1
13 0
14 0
15 1
16 1
17 0
18 0
19 1
20 0
21 1
22 1
23 0
24 1
25 0
26 0
27 1
28 0
29 0
30 1
31 1
32 0
33 0
34 1
35 0
36 1
37 1
38 0
39 0
40 1
41 0
42 1
43 0
44 0
45 1
46 0
47 0
48 0
49 3
50 0
51 1
52 1
53 0
54 1
55 1
56 0
57 1
58 0
59 0
60 0
61 1
62 0
63 0
64 2
65 0
66 1
67 0
68 0
69 1
70 1
71 0
72 0
73 0
74 1
75 1
76 1
77 0
78 0
79 1
80 0
81 0
82 1
83 0
84 1
85 0
86 0
87 1
88 0

List of values

[1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 0, 3, 0, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 1, 0, 0, 2, 0, 1, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0]