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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.

A384443 a(n) is the product of the prime digits of n; or 1 if n contains no prime digits.

Table of values

n a(n)
1 1
2 2
3 3
4 1
5 5
6 1
7 7
8 1
9 1
10 1
11 1
12 2
13 3
14 1
15 5
16 1
17 7
18 1
19 1
20 2
21 2
22 4
23 6
24 2
25 10
26 2
27 14
28 2
29 2
30 3
31 3
32 6
33 9
34 3
35 15
36 3
37 21
38 3
39 3
40 1
41 1
42 2
43 3
44 1
45 5
46 1
47 7
48 1
49 1
50 5
51 5
52 10
53 15
54 5
55 25
56 5
57 35
58 5
59 5
60 1
61 1
62 2
63 3
64 1
65 5
66 1
67 7
68 1
69 1
70 7
71 7
72 14
73 21
74 7
75 35
76 7
77 49
78 7
79 7
80 1
81 1
82 2
83 3
84 1

List of values

[1, 2, 3, 1, 5, 1, 7, 1, 1, 1, 1, 2, 3, 1, 5, 1, 7, 1, 1, 2, 2, 4, 6, 2, 10, 2, 14, 2, 2, 3, 3, 6, 9, 3, 15, 3, 21, 3, 3, 1, 1, 2, 3, 1, 5, 1, 7, 1, 1, 5, 5, 10, 15, 5, 25, 5, 35, 5, 5, 1, 1, 2, 3, 1, 5, 1, 7, 1, 1, 7, 7, 14, 21, 7, 35, 7, 49, 7, 7, 1, 1, 2, 3, 1]

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