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A093947 as a simple table

na(n)
17
279
379999
4799999
5799999999
679999999999
779999999999999999999999999
879999999999999999999999999999999999999999999999999
979999999999999999999999999999999999999999999999999999999999999999999999999999

[7,79,79999,799999,799999999,79999999999,
 79999999999999999999999999,
 79999999999999999999999999999999999999999999999999\
 ,
 79999999999999999999999999999999999999999999999999\
 999999999999999999999999999]