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A137758 as a simple table

na(n)
11
21
31
41
53
61
75
83
91
101
117
127
131
145
151
169
1731
189
195
201
211
2211
2349
2449
2511
261
277
281
2913
30105
3171
32209
33105
3471
3513
367
371
381
3915
4097
41351
42351
4397
4415
451
469
471
4817
49127
50545
511471
52545
53127
5417
559
561
571
5819
59161
60799
612561
622561
63799
64161
6519
661

[1,1,1,1,3,1,5,3,1,1,7,7,1,5,1,9,31,9,5,1,1,11,49,
 49,11,1,7,1,13,105,71,209,105,71,13,7,1,1,15,97,
 351,351,97,15,1,9,1,17,127,545,1471,545,127,17,9,
 1,1,19,161,799,2561,2561,799,161,19,1]