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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.

A190321 Number of nonzero digits when writing n in base where place values are squares, cf. A007961.

Table of values

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

List of values

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

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