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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.

A262689 a(n) = largest number k <= A000196(n) for which A002828(n-(k^2)) = A002828(n)-1.

Table of values

n a(n)
0 0
1 1
2 1
3 1
4 2
5 2
6 2
7 2
8 2
9 3
10 3
11 3
12 2
13 3
14 3
15 3
16 4
17 4
18 3
19 3
20 4
21 4
22 3
23 3
24 4
25 5
26 5
27 5
28 5
29 5
30 5
31 5
32 4
33 5
34 5
35 5
36 6
37 6
38 6
39 6
40 6
41 5
42 5
43 5
44 6
45 6
46 6
47 6
48 4
49 7
50 7
51 7
52 6
53 7
54 7
55 7
56 6
57 7
58 7
59 7
60 7
61 6
62 7
63 7
64 8
65 8
66 8
67 7
68 8
69 8
70 6
71 7
72 6
73 8
74 7
75 7
76 6
77 8
78 7
79 7
80 8
81 9
82 9
83 9
84 8
85 9
86 9
87 9
88 6
89 8
90 9
91 9
92 9
93 8
94 9
95 9
96 8
97 9
98 7
99 9
100 10
101 10
102 10
103 10
104 10
105 10
106 9
107 9
108 10
109 10
110 10
111 10
112 10
113 8
114 8
115 9
116 10
117 9
118 10
119 10
120 10
121 11

List of values

[0, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 2, 3, 3, 3, 4, 4, 3, 3, 4, 4, 3, 3, 4, 5, 5, 5, 5, 5, 5, 5, 4, 5, 5, 5, 6, 6, 6, 6, 6, 5, 5, 5, 6, 6, 6, 6, 4, 7, 7, 7, 6, 7, 7, 7, 6, 7, 7, 7, 7, 6, 7, 7, 8, 8, 8, 7, 8, 8, 6, 7, 6, 8, 7, 7, 6, 8, 7, 7, 8, 9, 9, 9, 8, 9, 9, 9, 6, 8, 9, 9, 9, 8, 9, 9, 8, 9, 7, 9, 10, 10, 10, 10, 10, 10, 9, 9, 10, 10, 10, 10, 10, 8, 8, 9, 10, 9, 10, 10, 10, 11]

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