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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.

A231015 Least k such that n = +- 1^2 +- 2^2 +- 3^2 +- 4^2 +- ... +- k^2 for some choice of +- signs.

Table of values

n a(n)
0 7
1 1
2 4
3 2
4 3
5 2
6 3
7 6
8 7
9 6
10 4
11 6
12 3
13 5
14 3
15 5
16 7
17 6
18 7
19 6
20 4
21 5
22 4
23 5
24 7
25 9
26 7
27 5
28 4
29 5
30 4
31 6
32 7
33 6
34 7
35 5
36 7
37 5
38 7
39 6
40 7
41 6
42 7
43 9
44 8
45 5
46 8
47 5
48 7
49 6
50 7
51 6
52 11
53 5
54 8
55 5
56 7
57 6
58 7
59 6
60 7
61 10
62 7
63 6
64 7
65 6
66 7
67 9
68 7
69 10
70 7
71 6
72 7
73 6
74 8
75 9
76 8
77 9
78 8
79 9
80 7
81 6
82 7
83 6
84 11
85 9

List of values

[7, 1, 4, 2, 3, 2, 3, 6, 7, 6, 4, 6, 3, 5, 3, 5, 7, 6, 7, 6, 4, 5, 4, 5, 7, 9, 7, 5, 4, 5, 4, 6, 7, 6, 7, 5, 7, 5, 7, 6, 7, 6, 7, 9, 8, 5, 8, 5, 7, 6, 7, 6, 11, 5, 8, 5, 7, 6, 7, 6, 7, 10, 7, 6, 7, 6, 7, 9, 7, 10, 7, 6, 7, 6, 8, 9, 8, 9, 8, 9, 7, 6, 7, 6, 11, 9]

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