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A163785 as a simple table

na(n)
13
215
317
445
573
683
7165
8177
9181
10229
11377
12383
13787
142585
153127
163635
174777
1836417
1963337
20166705
21418411

[3,15,17,45,73,83,165,177,181,229,377,383,787,
 2585,3127,3635,4777,36417,63337,166705,418411]