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A305883 as a simple table

na(n)
43
55
63
77
85
97
103
1111
123
1313
145
1511
165
1713
187
1911
203
2117
227
2313
243
2519
265
2717
285
2919
307
3117
3211
3313
343
3523
367
3719
385
3923
4011
4117
427
4323
4411
4519
4613
4717
483
4929
5013
5119
523
5331
545
5529
5611
5723
585
5931
607
6129
6213
6323
6417
6519
667
6731
683
6937
7011
7129
7217
7323
745
7537
7611
7731

[3,5,3,7,5,7,3,11,3,13,5,11,5,13,7,11,3,17,7,13,3,
 19,5,17,5,19,7,17,11,13,3,23,7,19,5,23,11,17,7,23,
 11,19,13,17,3,29,13,19,3,31,5,29,11,23,5,31,7,29,
 13,23,17,19,7,31,3,37,11,29,17,23,5,37,11,31]