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A147175 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
101
111
121
133
143
1511
1611
1727
1827
1957
2057
21269
22269

[1,1,1,1,1,1,1,1,1,1,1,1,3,3,11,11,27,27,57,57,
 269,269]