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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.

A217841 Fermat pseudoprimes n to base 3 for which sqrt(8*n + 1) is an integer.

Table of values

n a(n)
1 91
2 703
3 1891
4 2701
5 7381
6 8911
7 10585
8 12403
9 16471
10 18721
11 29161
12 38503
13 41041
14 49141
15 79003
16 88831
17 93961
18 104653
19 115921
20 146611
21 188191
22 218791
23 226801
24 269011
25 286903
26 314821
27 334153
28 364231
29 385003
30 497503
31 534061
32 597871
33 665281
34 721801
35 736291
36 765703
37 873181
38 954271
39 1056331
40 1237951

List of values

[91, 703, 1891, 2701, 7381, 8911, 10585, 12403, 16471, 18721, 29161, 38503, 41041, 49141, 79003, 88831, 93961, 104653, 115921, 146611, 188191, 218791, 226801, 269011, 286903, 314821, 334153, 364231, 385003, 497503, 534061, 597871, 665281, 721801, 736291, 765703, 873181, 954271, 1056331, 1237951]