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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.

A254315 Number of distinct digits in the prime factorization of n (counting terms of the form p^1 as p).

Table of values

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

List of values

[1, 1, 1, 1, 2, 1, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 1, 2, 2, 3, 2, 2, 2, 3, 2, 2, 2, 3, 2, 3, 2, 3, 2, 2, 3, 2, 2, 3, 2, 2, 3, 3, 2, 2, 2, 3, 3, 2, 2, 3, 2, 3, 3, 2, 3, 3, 2, 3, 2, 3, 2, 2, 2, 3, 3, 3, 2, 3, 2, 3, 2, 3, 2, 3, 3, 3, 3, 3]

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