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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.

A336406 a(n) = number of primes c + d, where c < d = odd composite(n), and c is composite.

Table of values

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

List of values

[2, 3, 4, 6, 6, 7, 7, 8, 9, 10, 10, 13, 13, 12, 12, 13, 14, 14, 14, 16, 16, 18, 18, 17, 19, 18, 17, 20, 21, 21, 23, 23, 22, 23, 24, 24, 26, 27, 27, 27, 26, 26, 29, 28, 27, 29, 28, 30, 30, 30, 31, 32, 31, 32, 33, 33, 34, 34, 33, 35, 35, 37, 37, 37, 38, 38, 40]

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

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