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A255281 as a simple table

na(n)
01
17
27
331
47
549
631
7127
87
949
1049
11217
1231
13217
14127
15511
167
1749
1849
19217
2049
21343
22217
23889
2431
25217
26217
27961
28127
29889
30511
312031
327
3349
3449
35217
3649
37343
38217
39889
4049
41343
42343
431519
44217
451519
46889
473577
4831
49217
50217
51961
52217
531519

[1,7,7,31,7,49,31,127,7,49,49,217,31,217,127,511,
 7,49,49,217,49,343,217,889,31,217,217,961,127,889,
 511,2031,7,49,49,217,49,343,217,889,49,343,343,
 1519,217,1519,889,3577,31,217,217,961,217,1519]