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A147096 as a simple table

na(n)
11
21
31
41
51
61
71
81
93
103
117
127
1315
1415
1531
1631
1773
1873
19307
20307
211451
221451
236775
246775
2533773
2633773
27192865

[1,1,1,1,1,1,1,1,3,3,7,7,15,15,31,31,73,73,307,
 307,1451,1451,6775,6775,33773,33773,192865]