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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.

A346689 Replace 5^k with (-1)^k in base-5 expansion of n.

Table of values

n a(n)
0 0
1 1
2 2
3 3
4 4
5 -1
6 0
7 1
8 2
9 3
10 -2
11 -1
12 0
13 1
14 2
15 -3
16 -2
17 -1
18 0
19 1
20 -4
21 -3
22 -2
23 -1
24 0
25 1
26 2
27 3
28 4
29 5
30 0
31 1
32 2
33 3
34 4
35 -1
36 0
37 1
38 2
39 3
40 -2
41 -1
42 0
43 1
44 2
45 -3
46 -2
47 -1
48 0
49 1
50 2
51 3
52 4
53 5
54 6
55 1
56 2
57 3
58 4
59 5
60 0
61 1
62 2
63 3
64 4
65 -1
66 0
67 1
68 2
69 3
70 -2
71 -1
72 0
73 1
74 2
75 3
76 4
77 5
78 6
79 7
80 2
81 3
82 4
83 5
84 6
85 1
86 2
87 3
88 4
89 5
90 0
91 1
92 2
93 3
94 4
95 -1
96 0
97 1
98 2
99 3
100 4
101 5
102 6
103 7
104 8

List of values

[0, 1, 2, 3, 4, -1, 0, 1, 2, 3, -2, -1, 0, 1, 2, -3, -2, -1, 0, 1, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, -1, 0, 1, 2, 3, -2, -1, 0, 1, 2, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, -1, 0, 1, 2, 3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 2, 3, 4, 5, 6, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8]