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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.

A322007 a(n) = number of primes of the form p = 2n - q, where q is a prime or semiprime.

Table of values

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

List of values

[0, 0, 1, 2, 3, 3, 4, 4, 6, 5, 6, 7, 8, 8, 9, 7, 8, 9, 11, 9, 11, 11, 11, 12, 13, 12, 13, 14, 13, 13, 16, 15, 16, 16, 14, 16, 18, 16, 19, 19, 17, 18, 21, 17, 19, 22, 19, 19, 24, 19, 21, 23, 20, 21, 26, 22, 23, 28, 23, 24, 29, 23, 24, 29, 21, 25, 29, 24, 25, 29, 27, 25, 33, 26, 27, 32, 27]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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