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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.

A367006 Number of distinct prime factors of n*2^n - 1.

Table of values

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

List of values

[0, 1, 1, 2, 2, 1, 2, 2, 2, 2, 2, 2, 3, 2, 2, 5, 3, 2, 3, 2, 4, 3, 3, 3, 2, 3, 3, 4, 4, 1, 3, 2, 3, 5, 3, 5, 2, 3, 2, 4, 4, 3, 5, 3, 4, 4, 4, 4, 4, 3, 3, 4, 4, 3, 4, 3, 4, 2, 5, 3, 3, 4, 3, 9, 5, 4, 3, 5, 4, 3, 3, 2, 4, 4, 1, 7, 3, 4, 5, 2, 1, 4, 4, 6, 2, 2, 4]

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