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A260830 as a simple table

na(n)
15
27
3557
4577
5587
6757
7787
8857
9877
10887
115557
125857
137577
147757
157877
168887
1755787
1857557
1957587
2057787
2158757
2258787
2375557
2475577
2575787
2677557
2777587
2878577
2978787
3078857
3178877
3278887
3385577
3487557
3587587
3687877
3787887
38555557
39555857
40557857
41558587

[5,7,557,577,587,757,787,857,877,887,5557,5857,
 7577,7757,7877,8887,55787,57557,57587,57787,58757,
 58787,75557,75577,75787,77557,77587,78577,78787,
 78857,78877,78887,85577,87557,87587,87877,87887,
 555557,555857,557857,558587]