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A185240
as a simple table
n
a(n)
1
11
2
13
3
79
4
127
5
503
6
617
7
709
8
857
9
1499
10
3823
11
135623
12
280979
[11,13,79,127,503,617,709,857,1499,3823,135623, 280979]