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A146780 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
101
111
121
135
145
1517
1617
1743
1843
19145
20145
21633
22633

[1,1,1,1,1,1,1,1,1,1,1,1,5,5,17,17,43,43,145,145,
 633,633]