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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.

A267263 Number of nonzero digits in representation of n in primorial base.

Table of values

n a(n)
0 0
1 1
2 1
3 2
4 1
5 2
6 1
7 2
8 2
9 3
10 2
11 3
12 1
13 2
14 2
15 3
16 2
17 3
18 1
19 2
20 2
21 3
22 2
23 3
24 1
25 2
26 2
27 3
28 2
29 3
30 1
31 2
32 2
33 3
34 2
35 3
36 2
37 3
38 3
39 4
40 3
41 4
42 2
43 3
44 3
45 4
46 3
47 4
48 2
49 3
50 3
51 4
52 3
53 4
54 2
55 3
56 3
57 4
58 3
59 4
60 1
61 2
62 2
63 3
64 2
65 3
66 2
67 3
68 3
69 4
70 3
71 4
72 2
73 3
74 3
75 4
76 3
77 4
78 2
79 3
80 3
81 4
82 3
83 4
84 2
85 3
86 3
87 4
88 3
89 4
90 1
91 2

List of values

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

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