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A193648 as a simple table

na(n)
11
21
33
41
55
67
71
87
913
1015
111
129
1319
1437
1533
161
1711
1825
1967
20105
2173
221
2313
2431
25105
26217
27297
28161
291
3015
3137
32151
33369
34721
35841
36355
371
3817
3943
40205
41561
421393
432377
442381
45783
461
4719
4849
49267
50793
512361
525105
537855
546741
551727
561
5721
5855
59337
601065
613673
629361

[1,1,3,1,5,7,1,7,13,15,1,9,19,37,33,1,11,25,67,
 105,73,1,13,31,105,217,297,161,1,15,37,151,369,
 721,841,355,1,17,43,205,561,1393,2377,2381,783,1,
 19,49,267,793,2361,5105,7855,6741,1727,1,21,55,
 337,1065,3673,9361]