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A255682 as a simple table

na(n)
13
27
313
415
521
673
7231
8301
9493
10895
11955
124069
135057
145415
1515325
1619845
1721603
1824577
1937877
2040193
2144283

[3,7,13,15,21,73,231,301,493,895,955,4069,5057,
 5415,15325,19845,21603,24577,37877,40193,44283]