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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.

A112399 a(n) = Sum_{k=1..n, gcd(k,n)=1} mu(k), where mu(k) = A008683(k) (the Moebius function).

Table of values

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

List of values

[1, 1, 0, 0, -1, 0, -1, -2, -2, -1, -1, -2, -2, -3, -2, -3, -1, -4, -2, -5, -4, -3, -1, -6, -3, -4, -3, -5, -1, -6, -3, -7, -5, -5, -3, -7, -1, -5, -3, -6, 0, -9, -2, -7, -6, -6, -2, -11, -4, -9, -5, -7, -2, -12, -5, -8, -5, -5, 0, -13, -1, -7, -6, -8, -4, -12, -1, -8, -5, -10, -2, -14, -3, -8, -9, -9, -4, -14, -3, -12, -7, -8, -3, -17]

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

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