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A145825 as a simple table

na(n)
11
25
31
45
517
621
717
821
91
105
111
125
1317
1421
1517
1621
1765
1869
1965
2069
2181
2285
2381
2485
2565
2669
2765
2869

[1,5,1,5,17,21,17,21,1,5,1,5,17,21,17,21,65,69,65,
 69,81,85,81,85,65,69,65,69]