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A147969 as a simple table

na(n)
12
27
323
423
571
671
7311
8311
9311
10311
11479
12479
131559
141559
151559
161559
175711
185711
1910559
2010559
2110559
2210559
2318191
2418191
2518191
2618191
2718191
2818191
2931391
3031391
31366791
32366791
33366791
34366791
35366791
36366791
37366791
38366791
39366791

[2,7,23,23,71,71,311,311,311,311,479,479,1559,
 1559,1559,1559,5711,5711,10559,10559,10559,10559,
 18191,18191,18191,18191,18191,18191,31391,31391,
 366791,366791,366791,366791,366791,366791,366791,
 366791,366791]