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A043355
as a simple table
n
a(n)
1
31
2
131
3
151
4
155
5
157
6
158
7
159
8
161
9
166
10
171
11
181
12
206
13
231
14
281
15
406
[31,131,151,155,157,158,159,161,166,171,181,206, 231,281,406]