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A146906 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
101
111
121
131
141
153
163
177
187
1913
2013
2127
2227
2381
2481
25287
26287
271153
281153
294961
304961

[1,1,1,1,1,1,1,1,1,1,1,1,1,1,3,3,7,7,13,13,27,27,
 81,81,287,287,1153,1153,4961,4961]