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A090155 as a simple table

na(n)
17
271
373
479
5733
67333
779999
8733333
9799999
1071111111
11799999999
1279999999999
1379999999999999999999999999
1479999999999999999999999999999999999999999999999999

[7,71,73,79,733,7333,79999,733333,799999,71111111,
 799999999,79999999999,79999999999999999999999999,
 79999999999999999999999999999999999999999999999999\
 ]