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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.

A145388 Sum of (k,n)*</span> for <span class="maths">k=1,2,...,n,</span> where (k,n)<span class="maths">* is the greatest divisor of k which is a unitary divisor of n.

Table of values

n a(n)
1 1
2 3
3 5
4 7
5 9
6 15
7 13
8 15
9 17
10 27
11 21
12 35
13 25
14 39
15 45
16 31
17 33
18 51
19 37
20 63
21 65
22 63
23 45
24 75
25 49
26 75
27 53
28 91
29 57
30 135
31 61
32 63
33 105
34 99
35 117
36 119
37 73
38 111
39 125
40 135
41 81
42 195
43 85
44 147
45 153
46 135
47 93
48 155
49 97
50 147
51 165
52 175
53 105
54 159

List of values

[1, 3, 5, 7, 9, 15, 13, 15, 17, 27, 21, 35, 25, 39, 45, 31, 33, 51, 37, 63, 65, 63, 45, 75, 49, 75, 53, 91, 57, 135, 61, 63, 105, 99, 117, 119, 73, 111, 125, 135, 81, 195, 85, 147, 153, 135, 93, 155, 97, 147, 165, 175, 105, 159]

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

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