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A205989 as a simple table

na(n)
07
117
2109
31019
410007
5100019
61000171
710000019
8100000007
91000000007
1010000000019
11100000000019
121000000000061
1310000000000051
14100000000000097
151000000000000091
1610000000000000061
17100000000000000019
181000000000000000177
1910000000000000000051

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