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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.

A005940 The Doudna sequence: write n-1 in binary; power of prime(k) in a(n) is # of 1's that are followed by k-1 0's.

Table of values

n a(n)
1 1
2 2
3 3
4 4
5 5
6 6
7 9
8 8
9 7
10 10
11 15
12 12
13 25
14 18
15 27
16 16
17 11
18 14
19 21
20 20
21 35
22 30
23 45
24 24
25 49
26 50
27 75
28 36
29 125
30 54
31 81
32 32
33 13
34 22
35 33
36 28
37 55
38 42
39 63
40 40
41 77
42 70
43 105
44 60
45 175
46 90
47 135
48 48
49 121
50 98
51 147
52 100
53 245
54 150
55 225
56 72
57 343
58 250
59 375
60 108
61 625
62 162
63 243
64 64
65 17
66 26
67 39

List of values

[1, 2, 3, 4, 5, 6, 9, 8, 7, 10, 15, 12, 25, 18, 27, 16, 11, 14, 21, 20, 35, 30, 45, 24, 49, 50, 75, 36, 125, 54, 81, 32, 13, 22, 33, 28, 55, 42, 63, 40, 77, 70, 105, 60, 175, 90, 135, 48, 121, 98, 147, 100, 245, 150, 225, 72, 343, 250, 375, 108, 625, 162, 243, 64, 17, 26, 39]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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