A065533 - OEIS

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A065533 as a simple table

n	a(n)
1	3
2	31
3	311
4	3119
5	31193
6	311951
7	3119533
8	31195343
9	311953441
10	3119534441
11	31195344413
12	311953444133
13	3119534441393
14	31195344413953
15	311953444139539
16	3119534441395579
17	31195344413955853
18	311953444139558593

[3,31,311,3119,31193,311951,3119533,31195343, 311953441,3119534441,31195344413,311953444133, 3119534441393,31195344413953,311953444139539, 3119534441395579,31195344413955853, 311953444139558593]