cp's OEIS Frontend

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.

A227760 Numbers n such that A227758(n) = sigma(sigma(n)) - sigma(n) - n > 0, where sigma(n) = A000203(n) = sum of the divisors of n.

Table of values

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

List of values

[5, 6, 8, 10, 11, 12, 14, 15, 17, 19, 20, 21, 22, 23, 24, 26, 27, 28, 29, 30, 32, 33, 34, 35, 38, 39, 40, 41, 42, 44, 45, 46, 47, 48, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 62, 63, 65, 66, 68, 69, 70, 71, 72, 74, 75, 76, 77, 78, 79, 80, 82, 83, 84, 85, 86, 87]

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

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