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A048981
as a simple table
n
a(n)
1
-11
2
-7
3
-3
4
-2
5
-1
6
2
7
3
8
5
9
6
10
7
11
11
12
13
13
17
14
19
15
21
16
29
17
33
18
37
19
41
20
57
21
73
[-11,-7,-3,-2,-1,2,3,5,6,7,11,13,17,19,21,29,33, 37,41,57,73]