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A002810 as a simple table

na(n)
11
27
311
427
577
6107
7111
8127
9177
10777
111127
121177
131777
147777
1511777
1627777
1777777
18107777
19111777
20127777
21177777
22777777
231127777
241177777
251777777
267777777
2711777777
2827777777
2977777777
30107777777
31111777777
32127777777
33177777777
34777777777

[1,7,11,27,77,107,111,127,177,777,1127,1177,1777,
 7777,11777,27777,77777,107777,111777,127777,
 177777,777777,1127777,1177777,1777777,7777777,
 11777777,27777777,77777777,107777777,111777777,
 127777777,177777777,777777777]