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A139391 as a simple table

na(n)
11
21
35
41
51
63
711
81
97
105
1117
123
135
147
1523
161
1713
189
1929
205
211
2211
2335
243
2519
2613
2741
287
2911
3015
3147
321
3325
3417
3553
369
377
3819
3959
405
4131
4221
4365
4411
4517
4623
4771
483
4937
5025
5177
5213
535
5427
5583
567
5743
5829
5989
6015
6123
6231
6395
641
6549
6633
67101
6817
6913
7035
71107
729
7355
7437
75113
7619
7729

[1,1,5,1,1,3,11,1,7,5,17,3,5,7,23,1,13,9,29,5,1,
 11,35,3,19,13,41,7,11,15,47,1,25,17,53,9,7,19,59,
 5,31,21,65,11,17,23,71,3,37,25,77,13,5,27,83,7,43,
 29,89,15,23,31,95,1,49,33,101,17,13,35,107,9,55,
 37,113,19,29]