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.

A280109 a(n) is the decimal value corresponding to the binary representation of the distribution of quadratic residues (value=1) and non-quadratic residues (value=0) mod n, where numbers are ordered left to right from 0 to n-1.

Table of values

n a(n)
1 1
2 3
3 6
4 12
5 25
6 54
7 116
8 200
9 402
10 825
11 1762
12 3204
13 6925
14 14964
15 25904
16 51264
17 119179
18 206226
19 424582
20 836616
21 1648692
22 3610338
23 8218192
24 13125760
25 26518825
26 56736525
27 105587858
28 210503748
29 434671993
30 848848176
31 1995529252
32 3359686720
33 7257392290
34 15621149067

List of values

[1, 3, 6, 12, 25, 54, 116, 200, 402, 825, 1762, 3204, 6925, 14964, 25904, 51264, 119179, 206226, 424582, 836616, 1648692, 3610338, 8218192, 13125760, 26518825, 56736525, 105587858, 210503748, 434671993, 848848176, 1995529252, 3359686720, 7257392290, 15621149067]