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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.

A253138 Number of ways to represent the n-th prime as the arithmetic mean of two semiprimes.

Table of values

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

List of values

[0, 0, 1, 1, 0, 1, 1, 1, 1, 2, 1, 3, 2, 4, 3, 4, 3, 3, 5, 7, 6, 5, 5, 8, 8, 7, 9, 7, 10, 10, 12, 11, 15, 12, 14, 14, 13, 11, 13, 15, 15, 14, 15, 20, 14, 15, 19, 20, 16, 17, 17, 17, 21, 24, 23, 24, 28, 23, 25, 24, 27, 25, 32, 29, 25, 21, 26, 31, 31, 29, 36, 32]

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

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