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.

A077770 Number of ordered pairs of integers (x,y) with n^2 < x^2 + y^2 < (n+1)^2; number of lattice points between circles of radii n and n+1.

Table of values

n a(n)
0 0
1 4
2 12
3 16
4 20
5 28
6 32
7 44
8 52
9 52
10 56
11 60
12 76
13 80
14 84
15 84
16 92
17 104
18 116
19 116
20 112
21 140
22 132
23 136
24 148
25 148
26 164
27 160
28 164
29 180
30 176
31 204
32 196
33 204
34 216
35 196
36 228
37 216
38 252
39 236
40 224
41 260
42 260
43 284
44 272
45 260
46 292
47 288
48 308
49 300
50 316
51 312
52 300
53 332
54 320
55 364

List of values

[0, 4, 12, 16, 20, 28, 32, 44, 52, 52, 56, 60, 76, 80, 84, 84, 92, 104, 116, 116, 112, 140, 132, 136, 148, 148, 164, 160, 164, 180, 176, 204, 196, 204, 216, 196, 228, 216, 252, 236, 224, 260, 260, 284, 272, 260, 292, 288, 308, 300, 316, 312, 300, 332, 320, 364]

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

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