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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.

A365939 Gilbreath transform of semiprimes (A001358).

Table of values

n a(n)
1 4
2 2
3 1
4 1
5 0
6 1
7 0
8 1
9 1
10 1
11 1
12 1
13 0
14 1
15 0
16 1
17 1
18 0
19 1
20 1
21 1
22 1
23 1
24 1
25 0
26 0
27 1
28 1
29 1
30 1
31 0
32 0
33 0
34 1
35 1
36 1
37 1
38 1
39 0
40 0
41 1
42 1
43 0
44 0
45 1
46 1
47 1
48 1
49 0
50 0
51 1
52 1
53 0
54 0
55 0
56 1
57 0
58 0
59 0
60 1
61 0
62 0
63 0
64 0
65 1
66 0
67 0
68 0
69 0
70 0
71 1
72 1
73 0
74 0
75 1
76 0
77 1
78 1
79 0
80 1
81 1
82 1
83 0
84 0
85 1
86 1
87 1

List of values

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