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A205989 as a simple table

n a(n)
0 7
1 17
2 109
3 1019
4 10007
5 100019
6 1000171
7 10000019
8 100000007
9 1000000007
10 10000000019
11 100000000019
12 1000000000061
13 10000000000051
14 100000000000097
15 1000000000000091
16 10000000000000061
17 100000000000000019
18 1000000000000000177
19 10000000000000000051

[7,17,109,1019,10007,100019,1000171,10000019,
 100000007,1000000007,10000000019,100000000019,
 1000000000061,10000000000051,100000000000097,
 1000000000000091,10000000000000061,
 100000000000000019,1000000000000000177,
 10000000000000000051]

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Last modified April 14 09:03 EDT 2021. Contains 342946 sequences. (Running on oeis4.)