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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.

A308754 a(0) = 0, a(n) = a(n-1) + 1 if 2*n + 3 is prime, otherwise a(n) = a(n-1).

Table of values

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

List of values

[0, 1, 2, 2, 3, 4, 4, 5, 6, 6, 7, 7, 7, 8, 9, 9, 9, 10, 10, 11, 12, 12, 13, 13, 13, 14, 14, 14, 15, 16, 16, 16, 17, 17, 18, 19, 19, 19, 20, 20, 21, 21, 21, 22, 22, 22, 22, 23, 23, 24, 25, 25, 26, 27, 27, 28, 28, 28, 28, 28, 28, 28, 29, 29, 30, 30, 30, 31]

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

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