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A209572 as a simple table

na(n)
11
21
33
41
53
65
71
83
911
107
111
123
1311
1429
159
161
173
1811
1941
2061
2111
221
233
2411
2541
26129
27111
2813
291
303
3111
3241
33153
34339
35183
3615
371
383
3911
4041
41153
42523
43771
44281
4517
461
473
4811
4941
50153
51571
521571
531569
54409
5519
561
573
5811
5941
60153
61571
622035
634161
642929
65571
6621

[1,1,3,1,3,5,1,3,11,7,1,3,11,29,9,1,3,11,41,61,11,
 1,3,11,41,129,111,13,1,3,11,41,153,339,183,15,1,3,
 11,41,153,523,771,281,17,1,3,11,41,153,571,1571,
 1569,409,19,1,3,11,41,153,571,2035,4161,2929,571,
 21]