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A146655 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
101
113
123
137
147
1519
1619
1743
1843
19173
20173
211027
221027

[1,1,1,1,1,1,1,1,1,1,3,3,7,7,19,19,43,43,173,173,
 1027,1027]