A088288 - OEIS

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A088288 as a simple table

n	a(n)
1	131
2	191
3	313
4	919
5	113111311
6	131333131
7	313111313
8	331333133
9	11199199111
10	99911911999
11	1111191911111
12	9999919199999
13	133131131131331
14	311313313313113
15	777997999799777
16	999779777977999
17	11177771717777111

[131,191,313,919,113111311,131333131,313111313, 331333133,11199199111,99911911999,1111191911111, 9999919199999,133131131131331,311313313313113, 777997999799777,999779777977999,11177771717777111]