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A137755 as a simple table

na(n)
15
27
37
49
531
69
711
849
949
1011
1113
1271
13209
1471
1513
1615
1797
18351
19351
2097
2115
2217
23127
24545
251471
26545
27127
2817
2919
30161
31799
322561
332561
34799
35161
3619
3721
38199
391121
404159
4110625
424159
431121
44199
4521

[5,7,7,9,31,9,11,49,49,11,13,71,209,71,13,15,97,
 351,351,97,15,17,127,545,1471,545,127,17,19,161,
 799,2561,2561,799,161,19,21,199,1121,4159,10625,
 4159,1121,199,21]