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.

A290321 Sum modulo n of all units u in Z/nZ such that Phi(3,u) is a unit, where Phi is the cyclotomic polynomial.

Table of values

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

List of values

[1, 2, 0, 0, 5, 1, 0, 6, 0, 0, 4, 1, 8, 5, 0, 0, 15, 1, 0, 8, 0, 0, 8, 0, 14, 18, 16, 0, 20, 1, 0, 11, 0, 25, 12, 1, 20, 14, 0, 0, 8, 1, 0, 15, 0, 0, 16, 7, 0, 17, 28, 0, 45, 0, 32, 20, 0, 0, 40, 1, 32, 24, 0, 30, 44, 1, 0, 23, 60, 0, 24, 1, 38, 25, 40, 66, 14, 1]

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

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