A089770 - OEIS

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A089770 as a simple table

n	a(n)
1	2
2	11
3	101
4	1009
5	10009
6	100049
7	1000081
8	10000169
9	100000049
10	1000000009
11	10000000069
12	100000000069
13	1000000000091
14	10000000000099
15	100000000000099
16	1000000000000091
17	10000000000000069
18	100000000000000049

[2,11,101,1009,10009,100049,1000081,10000169, 100000049,1000000009,10000000069,100000000069, 1000000000091,10000000000099,100000000000099, 1000000000000091,10000000000000069, 100000000000000049]