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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.

A071339 a(n) = the maximum number of lattice points touched by an origin-centered circle with radius <= n.

Table of values

n a(n)
0 1
1 4
2 4
3 8
4 8
5 12
6 12
7 12
8 12
9 16
10 16
11 16
12 16
13 16
14 16
15 16
16 16
17 16
18 16
19 24
20 24
21 24
22 24
23 24
24 24
25 24
26 24
27 24
28 24
29 24
30 24
31 24
32 24
33 24
34 32
35 32
36 32
37 32
38 32
39 32
40 32
41 32
42 32
43 32
44 32
45 32
46 32
47 32
48 32
49 32
50 32
51 32
52 32
53 32
54 32
55 32
56 32
57 32
58 32
59 32
60 32
61 32
62 32
63 32
64 32
65 36
66 36
67 36

List of values

[1, 4, 4, 8, 8, 12, 12, 12, 12, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 36, 36, 36]

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

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