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.

A290322 Sum modulo n of all units u in Z/nZ such that Phi(5,u) is a unit, where Phi is the cyclotomic polynomial.

Table of values

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

List of values

[1, 0, 0, 4, 0, 0, 0, 0, 9, 1, 0, 0, 0, 3, 0, 0, 0, 0, 8, 0, 12, 0, 0, 20, 0, 0, 0, 0, 18, 1, 0, 24, 0, 14, 0, 0, 0, 0, 16, 1, 0, 0, 24, 9, 0, 0, 0, 0, 45, 0, 0, 0, 0, 14, 0, 0, 0, 0, 36, 1, 32, 0, 0, 13, 24, 0, 0, 0, 14, 1, 0, 0, 0, 15, 0, 28, 0, 0, 32, 0, 42, 0]

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

Content is available under The OEIS End-User License Agreement.