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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.

A248623 Triangle T(n,k) read by rows, of number of primes in interval [k*n, (k+1)*n] exclusive, n>=k.

Table of values

n a(n)
1 0
2 1
3 1
4 1
5 1
6 1
7 2
8 1
9 1
10 2
11 1
12 2
13 2
14 1
15 1
16 2
17 2
18 2
19 1
20 1
21 2
22 2
23 2
24 1
25 2
26 2
27 2
28 1
29 2
30 3
31 2
32 1
33 2
34 1
35 2
36 2
37 3
38 2
39 2
40 3
41 2
42 2
43 2
44 2
45 2
46 4
47 2
48 2
49 3
50 2
51 2
52 3
53 2
54 1
55 4
56 3
57 3
58 3
59 2
60 2
61 3
62 2
63 2
64 4
65 1
66 2
67 4
68 2
69 4
70 2
71 3
72 3
73 1
74 4
75 2
76 2
77 2
78 2

List of values

[0, 1, 1, 1, 1, 1, 2, 1, 1, 2, 1, 2, 2, 1, 1, 2, 2, 2, 1, 1, 2, 2, 2, 1, 2, 2, 2, 1, 2, 3, 2, 1, 2, 1, 2, 2, 3, 2, 2, 3, 2, 2, 2, 2, 2, 4, 2, 2, 3, 2, 2, 3, 2, 1, 4, 3, 3, 3, 2, 2, 3, 2, 2, 4, 1, 2, 4, 2, 4, 2, 3, 3, 1, 4, 2, 2, 2, 2]