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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.

A121855 a(n) = ceiling(Pi*sqrt(n)).

Table of values

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

List of values

[0, 4, 5, 6, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 13, 14, 14, 15, 15, 15, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 22, 22, 22, 22, 22, 23, 23, 23, 23, 24, 24, 24, 24, 24, 25, 25, 25, 25, 25, 26, 26, 26, 26, 26, 27, 27, 27]

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