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A083836 as a simple table

na(n)
17
255
3595
4727
5787
65995
759995
872127
972727
1078187
1178787
12599995
135999995
147212127
157218127
167272727
177278727
187812187
197818187
207872787
217878787
2259999995
23599999995
24721212127
25721272127
26721818127
27721878127
28727212727

[7,55,595,727,787,5995,59995,72127,72727,78187,
 78787,599995,5999995,7212127,7218127,7272727,
 7278727,7812187,7818187,7872787,7878787,59999995,
 599999995,721212127,721272127,721818127,721878127,
 727212727]