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A147187 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
101
1113
1213
1361
1461
15329
16329
172787
182787
1939701
2039701
21747265
22747265
2318941331
2418941331
25668354617
26668354617

[1,1,1,1,1,1,1,1,1,1,13,13,61,61,329,329,2787,
 2787,39701,39701,747265,747265,18941331,18941331,
 668354617,668354617]