cp's OEIS Frontend

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.

A263239 Euler pseudoprimes to base 9: composite integers such that abs(9^((n - 1)/2)) == 1 mod n.

Table of values

n a(n)
1 4
2 28
3 91
4 121
5 286
6 532
7 671
8 703
9 949
10 1036
11 1105
12 1541
13 1729
14 1891
15 2465
16 2665
17 2701
18 2821
19 3281
20 3367
21 3751
22 4636
23 4961
24 5551
25 6364
26 6601
27 7381
28 8401
29 8911
30 10585
31 11011
32 11476
33 12403
34 14383
35 15203
36 15457
37 15841
38 16471
39 16531
40 18721
41 19345
42 19684
43 23521
44 24046
45 24661
46 24727

List of values

[4, 28, 91, 121, 286, 532, 671, 703, 949, 1036, 1105, 1541, 1729, 1891, 2465, 2665, 2701, 2821, 3281, 3367, 3751, 4636, 4961, 5551, 6364, 6601, 7381, 8401, 8911, 10585, 11011, 11476, 12403, 14383, 15203, 15457, 15841, 16471, 16531, 18721, 19345, 19684, 23521, 24046, 24661, 24727]