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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.

A169821 a(n) = n*n in carryless arithmetic mod 9 in base 10.

Table of values

n a(n)
0 0
1 1
2 4
3 0
4 7
5 7
6 0
7 4
8 1
9 0
10 100
11 121
12 144
13 160
14 187
15 117
16 130
17 154
18 171
19 100
20 400
21 441
22 484
23 430
24 477
25 427
26 460
27 414
28 451
29 400
30 0
31 61
32 34
33 0
34 67
35 37
36 0
37 64
38 31
39 0
40 700
41 781
42 774
43 760
44 757
45 747
46 730
47 724
48 711
49 700
50 700
51 711
52 724
53 730
54 747
55 757
56 760
57 774
58 781
59 700
60 0
61 31
62 64

List of values

[0, 1, 4, 0, 7, 7, 0, 4, 1, 0, 100, 121, 144, 160, 187, 117, 130, 154, 171, 100, 400, 441, 484, 430, 477, 427, 460, 414, 451, 400, 0, 61, 34, 0, 67, 37, 0, 64, 31, 0, 700, 781, 774, 760, 757, 747, 730, 724, 711, 700, 700, 711, 724, 730, 747, 757, 760, 774, 781, 700, 0, 31, 64]

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

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