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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.

A292918 Let A_n be a square n X n matrix with entries A_n(i,j)=1 if i+j is prime, and A_n(i,j)=0 otherwise. Then a(n) counts the 1's in A_n.

Table of values

n a(n)
1 1
2 3
3 5
4 9
5 11
6 15
7 19
8 23
9 29
10 37
11 43
12 51
13 57
14 63
15 71
16 81
17 89
18 97
19 105
20 113
21 123
22 135
23 145
24 157
25 169
26 181
27 195
28 209
29 221
30 235
31 249
32 263
33 277
34 293
35 309
36 327
37 345
38 363
39 381
40 401
41 419
42 439
43 457
44 475
45 495
46 515
47 533
48 551
49 571
50 591
51 613
52 637
53 659
54 683
55 709
56 735

List of values

[1, 3, 5, 9, 11, 15, 19, 23, 29, 37, 43, 51, 57, 63, 71, 81, 89, 97, 105, 113, 123, 135, 145, 157, 169, 181, 195, 209, 221, 235, 249, 263, 277, 293, 309, 327, 345, 363, 381, 401, 419, 439, 457, 475, 495, 515, 533, 551, 571, 591, 613, 637, 659, 683, 709, 735]