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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.

A020136 Fermat pseudoprimes to base 4.

Table of values

n a(n)
1 15
2 85
3 91
4 341
5 435
6 451
7 561
8 645
9 703
10 1105
11 1247
12 1271
13 1387
14 1581
15 1695
16 1729
17 1891
18 1905
19 2047
20 2071
21 2465
22 2701
23 2821
24 3133
25 3277
26 3367
27 3683
28 4033
29 4369
30 4371
31 4681
32 4795
33 4859
34 5461
35 5551
36 6601
37 6643
38 7957
39 8321
40 8481
41 8695
42 8911
43 9061
44 9131

List of values

[15, 85, 91, 341, 435, 451, 561, 645, 703, 1105, 1247, 1271, 1387, 1581, 1695, 1729, 1891, 1905, 2047, 2071, 2465, 2701, 2821, 3133, 3277, 3367, 3683, 4033, 4369, 4371, 4681, 4795, 4859, 5461, 5551, 6601, 6643, 7957, 8321, 8481, 8695, 8911, 9061, 9131]