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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.

A227783 Stufe of Q(sqrt(-k)), where k is the n-th squarefree number.

Table of values

n a(n)
1 1
2 2
3 2
4 2
5 2
6 4
7 2
8 2
9 2
10 2
11 4
12 2
13 2
14 2
15 2
16 4
17 2
18 2
19 2
20 4
21 2
22 2
23 2
24 2
25 2
26 4
27 2
28 2
29 2
30 2
31 4
32 2
33 2
34 4
35 2
36 2
37 2
38 2
39 2
40 2
41 2
42 2
43 2
44 2
45 4
46 2
47 2
48 2
49 2
50 4
51 2
52 2
53 2
54 2
55 4
56 2
57 2
58 2
59 2
60 4
61 2
62 2
63 2
64 4
65 2
66 2
67 2
68 2
69 2
70 4
71 2
72 2
73 2
74 2
75 4
76 2
77 2
78 4
79 2
80 2
81 2
82 2
83 2
84 2
85 2
86 2
87 2
88 2
89 4
90 2
91 2
92 2
93 4

List of values

[1, 2, 2, 2, 2, 4, 2, 2, 2, 2, 4, 2, 2, 2, 2, 4, 2, 2, 2, 4, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 4, 2, 2, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 4, 2, 2, 2, 2, 4, 2, 2, 2, 2, 4, 2, 2, 2, 4, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 4, 2, 2, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 4, 2, 2, 2, 4]

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