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A347863 as a simple table

na(n)
17
221
393
4357
5381
6681
71541
87181
924573
1036893
11192061
12388669
13393213
141505533
151572861
1610678781
1724736253

[7,21,93,357,381,681,1541,7181,24573,36893,192061,
 388669,393213,1505533,1572861,10678781,24736253]