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A321901 as a simple table

na(n)
11
21
33
41
53
65
77
81
93
1013
117
129
1311
145
1515
161
1719
1829
197
2025
2127
2221
2315
2417
253
2613
2723
289
2911
305
3131
321
3319
3429
357
3657
3727
3821
3915
4049
4135
4213
4323
4441
4543
465
4731
4833
4951
5061
5139
5225
5359
5453
5547
5617
573
5845
5955
609
6111
6237
6363

[1,1,3,1,3,5,7,1,3,13,7,9,11,5,15,1,19,29,7,25,27,
 21,15,17,3,13,23,9,11,5,31,1,19,29,7,57,27,21,15,
 49,35,13,23,41,43,5,31,33,51,61,39,25,59,53,47,17,
 3,45,55,9,11,37,63]