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A147510 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
101
111
121
133
143
159
169
1723
1823
1981
2081
21267
22267
231053
241053
256173
266173

[1,1,1,1,1,1,1,1,1,1,1,1,3,3,9,9,23,23,81,81,267,
 267,1053,1053,6173,6173]