A037666 - OEIS

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A037666 as a simple table

n	a(n)
1	3
2	31
3	310
4	3103
5	31031
6	310310
7	3103103
8	31031031
9	310310310
10	3103103103
11	31031031031
12	310310310310
13	3103103103103
14	31031031031031
15	310310310310310
16	3103103103103103

[3,31,310,3103,31031,310310,3103103,31031031, 310310310,3103103103,31031031031,310310310310, 3103103103103,31031031031031,310310310310310, 3103103103103103]