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A336863 as a simple table

na(n)
13
25
33
411
57
63
719
817
97
103
1141
1239
1319
147
153
1679
1785
1847
1919
207
213
22163
23187
24119
2549
2619
277
283
29163
30187
31119
3249
3319
347
353
36305
37425
38273
39129
4049
4119
427
433
44603
45955
46657
47325
48131
4949
5019
517
523
531143
542169
551517
56809
57337
58131
5949
6019
617
623

[3,5,3,11,7,3,19,17,7,3,41,39,19,7,3,79,85,47,19,
 7,3,163,187,119,49,19,7,3,163,187,119,49,19,7,3,
 305,425,273,129,49,19,7,3,603,955,657,325,131,49,
 19,7,3,1143,2169,1517,809,337,131,49,19,7,3]