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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.

A151971 Numbers n such that n^2 - n is divisible by 21.

Table of values

n a(n)
1 0
2 1
3 7
4 15
5 21
6 22
7 28
8 36
9 42
10 43
11 49
12 57
13 63
14 64
15 70
16 78
17 84
18 85
19 91
20 99
21 105
22 106
23 112
24 120
25 126
26 127
27 133
28 141
29 147
30 148
31 154
32 162
33 168
34 169
35 175
36 183
37 189
38 190
39 196
40 204
41 210
42 211
43 217
44 225
45 231
46 232
47 238
48 246
49 252
50 253
51 259
52 267
53 273
54 274
55 280
56 288
57 294
58 295
59 301
60 309

List of values

[0, 1, 7, 15, 21, 22, 28, 36, 42, 43, 49, 57, 63, 64, 70, 78, 84, 85, 91, 99, 105, 106, 112, 120, 126, 127, 133, 141, 147, 148, 154, 162, 168, 169, 175, 183, 189, 190, 196, 204, 210, 211, 217, 225, 231, 232, 238, 246, 252, 253, 259, 267, 273, 274, 280, 288, 294, 295, 301, 309]

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

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