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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.

A381499 a(n) = sum of numbers k < n such that 1 < gcd(k,n) < k and rad(k) does not divide n, where rad = A007947.

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 6
9 6
10 6
11 0
12 10
13 0
14 28
15 28
16 42
17 0
18 39
19 0
20 65
21 65
22 80
23 0
24 102
25 45
26 126
27 96
28 159
29 0
30 111
31 0
32 210
33 148
34 210
35 138
36 253
37 0
38 280
39 221
40 338
41 0
42 342
43 0
44 411
45 366
46 444
47 0
48 547
49 140
50 563
51 403
52 601
53 0
54 700
55 344
56 708
57 512
58 750
59 0
60 751
61 0
62 868
63 703
64 930

List of values

[0, 0, 0, 0, 0, 0, 0, 6, 6, 6, 0, 10, 0, 28, 28, 42, 0, 39, 0, 65, 65, 80, 0, 102, 45, 126, 96, 159, 0, 111, 0, 210, 148, 210, 138, 253, 0, 280, 221, 338, 0, 342, 0, 411, 366, 444, 0, 547, 140, 563, 403, 601, 0, 700, 344, 708, 512, 750, 0, 751, 0, 868, 703, 930]

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

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