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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.

A374436 Triangle read by rows: T(n, k) = Product_{p in PF(n) union PF(k)} p, where PF(a) is the set of the prime factors of a.

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 2
5 2
6 3
7 3
8 6
9 3
10 2
11 2
12 2
13 6
14 2
15 5
16 5
17 10
18 15
19 10
20 5
21 6
22 6
23 6
24 6
25 6
26 30
27 6
28 7
29 7
30 14
31 21
32 14
33 35
34 42
35 7
36 2
37 2
38 2
39 6
40 2
41 10
42 6
43 14
44 2
45 3
46 3
47 6
48 3
49 6
50 15
51 6
52 21
53 6
54 3
55 10
56 10
57 10
58 30
59 10
60 10
61 30
62 70
63 10
64 30
65 10
66 11
67 11
68 22
69 33
70 22
71 55
72 66
73 77
74 22
75 33
76 110
77 11

List of values

[1, 1, 1, 2, 2, 2, 3, 3, 6, 3, 2, 2, 2, 6, 2, 5, 5, 10, 15, 10, 5, 6, 6, 6, 6, 6, 30, 6, 7, 7, 14, 21, 14, 35, 42, 7, 2, 2, 2, 6, 2, 10, 6, 14, 2, 3, 3, 6, 3, 6, 15, 6, 21, 6, 3, 10, 10, 10, 30, 10, 10, 30, 70, 10, 30, 10, 11, 11, 22, 33, 22, 55, 66, 77, 22, 33, 110, 11]

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