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A147277 as a simple table

na(n)
11
21
31
41
51
61
71
81
99
109
1133
1233
13137
14137
151037
161037
1714193
1814193
19449857
20449857
2113397625
2213397625

[1,1,1,1,1,1,1,1,9,9,33,33,137,137,1037,1037,
 14193,14193,449857,449857,13397625,13397625]