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A146812 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
101
113
123
137
147
1519
1619
1747
1847
19187
20187
211053
221053

[1,1,1,1,1,1,1,1,1,1,3,3,7,7,19,19,47,47,187,187,
 1053,1053]