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.

A325126 a(1) = 1; a(n) = -Sum_{d|n, d rad(n/d) * a(d), where rad = A007947.

Table of values

n a(n)
1 1
2 -2
3 -3
4 2
5 -5
6 6
7 -7
8 -2
9 6
10 10
11 -11
12 -6
13 -13
14 14
15 15
16 2
17 -17
18 -12
19 -19
20 -10
21 21
22 22
23 -23
24 6
25 20
26 26
27 -12
28 -14
29 -29
30 -30
31 -31
32 -2
33 33
34 34
35 35
36 12
37 -37
38 38
39 39
40 10
41 -41
42 -42
43 -43
44 -22
45 -30
46 46
47 -47
48 -6
49 42
50 -40
51 51
52 -26
53 -53
54 24
55 55
56 14
57 57
58 58
59 -59
60 30

List of values

[1, -2, -3, 2, -5, 6, -7, -2, 6, 10, -11, -6, -13, 14, 15, 2, -17, -12, -19, -10, 21, 22, -23, 6, 20, 26, -12, -14, -29, -30, -31, -2, 33, 34, 35, 12, -37, 38, 39, 10, -41, -42, -43, -22, -30, 46, -47, -6, 42, -40, 51, -26, -53, 24, 55, 14, 57, 58, -59, 30]