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A146394 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
101
113
123
139
149
1523
1623
1777
1877
19415
20415
212809
222809
2321039
2421039

[1,1,1,1,1,1,1,1,1,1,3,3,9,9,23,23,77,77,415,415,
 2809,2809,21039,21039]