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.

A355827 a(1) = 1, and for n > 1, a(n) = -Sum_{d|n, d A302777(n/d) * a(d).

Table of values

n a(n)
1 1
2 -1
3 -1
4 0
5 -1
6 2
7 -1
8 1
9 0
10 2
11 -1
12 -1
13 -1
14 2
15 2
16 -2
17 -1
18 -1
19 -1
20 -1
21 2
22 2
23 -1
24 -2
25 0
26 2
27 1
28 -1
29 -1
30 -6
31 -1
32 2
33 2
34 2
35 2
36 2
37 -1
38 2
39 2
40 -2
41 -1
42 -6
43 -1
44 -1
45 -1
46 2
47 -1
48 6
49 0
50 -1
51 2
52 -1
53 -1
54 -2
55 2
56 -2
57 2
58 2
59 -1
60 6
61 -1
62 2
63 -1
64 0
65 2
66 -6
67 -1
68 -1
69 2
70 -6
71 -1
72 0
73 -1
74 2
75 -1
76 -1
77 2
78 -6
79 -1
80 6
81 -2
82 2
83 -1
84 6
85 2
86 2
87 2
88 -2
89 -1
90 6
91 2

List of values

[1, -1, -1, 0, -1, 2, -1, 1, 0, 2, -1, -1, -1, 2, 2, -2, -1, -1, -1, -1, 2, 2, -1, -2, 0, 2, 1, -1, -1, -6, -1, 2, 2, 2, 2, 2, -1, 2, 2, -2, -1, -6, -1, -1, -1, 2, -1, 6, 0, -1, 2, -1, -1, -2, 2, -2, 2, 2, -1, 6, -1, 2, -1, 0, 2, -6, -1, -1, 2, -6, -1, 0, -1, 2, -1, -1, 2, -6, -1, 6, -2, 2, -1, 6, 2, 2, 2, -2, -1, 6, 2]