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A243883 as a simple table

na(n)
15
21
313
45
529
65
753
817
985
1013
11125
1237
13173
1425
15229
1665
17293
1841
19365
20101
21445
2261
23533
24145
25629
2685
27733
28197
29845
30113
31965
32257
331093
34145
351229
36325
371373
38181
391525
40401
411685
42221
431853
44485
452029
46265

[5,1,13,5,29,5,53,17,85,13,125,37,173,25,229,65,
 293,41,365,101,445,61,533,145,629,85,733,197,845,
 113,965,257,1093,145,1229,325,1373,181,1525,401,
 1685,221,1853,485,2029,265]