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A130142
as a simple table
n
a(n)
0
1
1
3
2
5
3
7
4
3
5
11
6
13
7
53
8
17
9
19
10
73
11
23
12
5
13
9343
14
29
15
31
16
113
17
-1
18
37
19
313
20
41
21
43
[1,3,5,7,3,11,13,53,17,19,73,23,5,9343,29,31,113, -1,37,313,41,43]
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Last modified May 22 00:16 EDT 2013. Contains 225508 sequences.