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A306400 as a simple table

na(n)
15
27
35
47
511
623
75
87
97
1011
115
127
137
1411
155
167
17701
187
195
205
217
227
2341
2411
257
2619
2713
285
297
3031
3117
3213
3311
3431
3541
3613
3731
387
3929
4011
4137
4213
4353
4411
4519
4619
4711
4813
4923
5037
517
5241
5323
547
5529
565
5771
585
5913
6029
6113
6213
6359
6497
6511
6637
6717
687
697
705
717
72157

[5,7,5,7,11,23,5,7,7,11,5,7,7,11,5,7,701,7,5,5,7,
 7,41,11,7,19,13,5,7,31,17,13,11,31,41,13,31,7,29,
 11,37,13,53,11,19,19,11,13,23,37,7,41,23,7,29,5,
 71,5,13,29,13,13,59,97,11,37,17,7,7,5,7,157]