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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.

A139711 Numbers k such that the sum of (the largest divisor of k that is <= sqrt(k)) and (the smallest divisor of k that is >= sqrt(k)) is even.

Table of values

n a(n)
1 1
2 3
3 4
4 5
5 7
6 8
7 9
8 11
9 13
10 15
11 16
12 17
13 19
14 21
15 23
16 24
17 25
18 27
19 29
20 31
21 32
22 33
23 35
24 36
25 37
26 39
27 41
28 43
29 45
30 47
31 48
32 49
33 51
34 53
35 55
36 57
37 59
38 60
39 61
40 63
41 64
42 65
43 67
44 69
45 71
46 73
47 75
48 77
49 79
50 80
51 81
52 83
53 85
54 87
55 89
56 91
57 93
58 95
59 96
60 97
61 99
62 100
63 101
64 103
65 105
66 107
67 109
68 111
69 112

List of values

[1, 3, 4, 5, 7, 8, 9, 11, 13, 15, 16, 17, 19, 21, 23, 24, 25, 27, 29, 31, 32, 33, 35, 36, 37, 39, 41, 43, 45, 47, 48, 49, 51, 53, 55, 57, 59, 60, 61, 63, 64, 65, 67, 69, 71, 73, 75, 77, 79, 80, 81, 83, 85, 87, 89, 91, 93, 95, 96, 97, 99, 100, 101, 103, 105, 107, 109, 111, 112]

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

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