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A260827 as a simple table

na(n)
15
27
3557
4577
5757
65077
75507
85557
97057
107507
117577
127757
1350077
1450707
1550777
1655057
1757077
1857557
1970507
2075557
2175577
2275707
2377557
24500057
25500777
26505777
27507077
28507557
29507757
30550007
31550577
32550757
33555077
34555557
35555707
36557057
37570077
38575077

[5,7,557,577,757,5077,5507,5557,7057,7507,7577,
 7757,50077,50707,50777,55057,57077,57557,70507,
 75557,75577,75707,77557,500057,500777,505777,
 507077,507557,507757,550007,550577,550757,555077,
 555557,555707,557057,570077,575077]