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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.

A066947 Number of elements of order 2 in GL(2,Z_n).

Table of values

n a(n)
2 3
3 13
4 27
5 31
6 55
7 57
8 175
9 109
10 127
11 133
12 391
13 183
14 231
15 447
16 607
17 307
18 439
19 381
20 895
21 811
22 535
23 553
24 2463
25 751
26 735
27 973
28 1623
29 871
30 1791
31 993
32 2335
33 1875
34 1231
35 1855
36 3079
37 1407
38 1527
39 2575
40 5631
41 1723
42 3247
43 1893
44 3751
45 3519
46 2215
47 2257
48 8511
49 2745

List of values

[3, 13, 27, 31, 55, 57, 175, 109, 127, 133, 391, 183, 231, 447, 607, 307, 439, 381, 895, 811, 535, 553, 2463, 751, 735, 973, 1623, 871, 1791, 993, 2335, 1875, 1231, 1855, 3079, 1407, 1527, 2575, 5631, 1723, 3247, 1893, 3751, 3519, 2215, 2257, 8511, 2745]

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

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