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A137759 as a simple table

na(n)
11
21
31
41
51
63
75
81
93
101
117
127
131
141
155
169
1731
189
191
205
211
2211
2349
2449
2511
261
271
287
2913
3071
31105
32209
3371
34105
3513
361
377
381
3915
4097
41351
42351
4397
4415
451
461
479
4817
49127
50545
511471
52545
53127
5417
551
569
571
5819
59161
60799
612561
622561
63799
64161
6519
661

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