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.

A087249 Squarefree numbers k such that sigma(k) is not squarefree.

Table of values

n a(n)
1 3
2 6
3 7
4 10
5 11
6 14
7 15
8 17
9 19
10 21
11 22
12 23
13 30
14 31
15 33
16 34
17 35
18 38
19 39
20 42
21 43
22 46
23 47
24 51
25 53
26 55
27 57
28 58
29 59
30 62
31 65
32 66
33 67
34 69
35 70
36 71
37 77
38 78
39 79
40 82
41 83
42 85
43 86
44 87
45 89
46 91
47 93
48 94
49 95
50 97
51 102
52 103
53 105
54 106
55 107
56 110
57 111
58 114
59 115
60 118
61 119
62 123
63 127
64 129
65 130

List of values

[3, 6, 7, 10, 11, 14, 15, 17, 19, 21, 22, 23, 30, 31, 33, 34, 35, 38, 39, 42, 43, 46, 47, 51, 53, 55, 57, 58, 59, 62, 65, 66, 67, 69, 70, 71, 77, 78, 79, 82, 83, 85, 86, 87, 89, 91, 93, 94, 95, 97, 102, 103, 105, 106, 107, 110, 111, 114, 115, 118, 119, 123, 127, 129, 130]

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

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