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A147069 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
101
1113
1213
1365
1465
15297
16297
172247
182247
1924427
2024427
21296303
22296303
236915839
246915839
25203810183
26203810183

[1,1,1,1,1,1,1,1,1,1,13,13,65,65,297,297,2247,
 2247,24427,24427,296303,296303,6915839,6915839,
 203810183,203810183]