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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.

A048947 Let b(n) be the terms of A046528. Then sigma(b(n))=2^(a(n)), where sigma=A000203 is the sum of divisors function.

Table of values

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

List of values

[0, 2, 3, 5, 5, 7, 7, 8, 9, 10, 10, 12, 12, 13, 14, 15, 15, 16, 17, 17, 18, 18, 19, 19, 20, 20, 20, 21, 21, 22, 22, 22, 22, 23, 23, 24, 24, 24, 24, 25, 25, 25, 26, 26, 26, 27, 27, 27, 27, 28, 28, 29, 29, 29, 29, 30, 30, 31, 31, 31, 31, 32, 32, 32, 33, 33, 33, 34, 34, 34, 34, 35]

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