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A105439 as a simple table

na(n)
13
25
33
45
53
617
75
83
959
105
113
1211
1317
145
153
1629
175
183
1917
2041
2111
2241
235
243
255
263
27137
2811
2971
305
313
325
333
3417
3529
3611
3771
385
393
405
413
425
433
4411
4517
465
473
48137
495
503
5141
5211
5317
545
553
5641
575
583
5911
60227
615
623
6371
6411
65137
665
673
6841
6971
7041
7129
7259
7329
7417
75179
7611
77191
785
793
805
813

[3,5,3,5,3,17,5,3,59,5,3,11,17,5,3,29,5,3,17,41,
 11,41,5,3,5,3,137,11,71,5,3,5,3,17,29,11,71,5,3,5,
 3,5,3,11,17,5,3,137,5,3,41,11,17,5,3,41,5,3,11,
 227,5,3,71,11,137,5,3,41,71,41,29,59,29,17,179,11,
 191,5,3,5,3]