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A147433 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
101
111
121
133
143
159
169
1719
1819
1943
2043
21151
22151
23665
24665
253477
263477

[1,1,1,1,1,1,1,1,1,1,1,1,3,3,9,9,19,19,43,43,151,
 151,665,665,3477,3477]