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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.

A038894 Primes p such that 21 is not a square mod p.

Table of values

n a(n)
1 2
2 11
3 13
4 19
5 23
6 29
7 31
8 53
9 61
10 71
11 73
12 97
13 103
14 107
15 113
16 137
17 139
18 149
19 157
20 179
21 181
22 191
23 197
24 199
25 223
26 229
27 233
28 239
29 241
30 263
31 271
32 281
33 283
34 307
35 313
36 317
37 347
38 349
39 359
40 367
41 389
42 397
43 401
44 409
45 431
46 433
47 439
48 443
49 449
50 491
51 523
52 557
53 569
54 577
55 599
56 601

List of values

[2, 11, 13, 19, 23, 29, 31, 53, 61, 71, 73, 97, 103, 107, 113, 137, 139, 149, 157, 179, 181, 191, 197, 199, 223, 229, 233, 239, 241, 263, 271, 281, 283, 307, 313, 317, 347, 349, 359, 367, 389, 397, 401, 409, 431, 433, 439, 443, 449, 491, 523, 557, 569, 577, 599, 601]