cp's OEIS Frontend

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.

A066665 a(n) = #{(x,y) | 0<=y<=x<=n and x+y is prime}.

Table of values

n a(n)
0 1
1 3
2 5
3 7
4 9
5 11
6 14
7 16
8 19
9 23
10 27
11 31
12 35
13 38
14 42
15 47
16 52
17 56
18 61
19 65
20 70
21 76
22 82
23 88
24 94
25 100
26 107
27 114
28 121
29 128
30 136
31 143
32 150
33 158
34 166
35 175
36 185
37 194
38 203
39 213
40 223
41 233
42 243
43 252
44 262
45 272
46 282
47 291
48 301
49 311
50 322
51 334
52 346

List of values

[1, 3, 5, 7, 9, 11, 14, 16, 19, 23, 27, 31, 35, 38, 42, 47, 52, 56, 61, 65, 70, 76, 82, 88, 94, 100, 107, 114, 121, 128, 136, 143, 150, 158, 166, 175, 185, 194, 203, 213, 223, 233, 243, 252, 262, 272, 282, 291, 301, 311, 322, 334, 346]