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A146410 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
101
111
121
137
147
1521
1621
1753
1853
19267
20267
211477
221477
2311799
2411799

[1,1,1,1,1,1,1,1,1,1,1,1,7,7,21,21,53,53,267,267,
 1477,1477,11799,11799]