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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.

A372804 Decimal expansion of Sum_{k >= 1, A034887(k) even} 1/2^k.

Table of values

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

List of values

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