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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.

A237768 Number of primes p < n with pi(n-p) a Sophie Germain prime, where pi(.) is given by A000720.

Table of values

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

List of values

[0, 0, 0, 0, 1, 2, 2, 3, 2, 2, 2, 1, 2, 3, 2, 3, 3, 2, 2, 1, 1, 3, 3, 2, 2, 1, 1, 2, 2, 1, 1, 1, 2, 5, 5, 4, 4, 4, 3, 4, 4, 4, 4, 3, 3, 4, 4, 4, 4, 3, 3, 4, 4, 3, 3, 2, 2, 3, 3, 1, 1, 3, 3, 5, 5, 2, 2, 1, 1, 3, 3, 4, 4, 3, 3, 4, 4, 4, 4, 1]

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