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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.

A071986 Parity of the prime-counting function pi(n).

Table of values

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

List of values

[0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1]