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A208523 as a simple table

na(n)
11
21
33
41
53
65
71
83
97
1011
111
123
139
1419
1521
161
173
1811
1927
2043
2143
221
233
2413
2535
2669
27103
2885
291
303
3115
3243
3399
34183
35231
36171
371
383
3917
4051
41133
42283
43449
44523
45341
461
473
4819
4959
50171
51403
52747
531107
541155
55683
561
573
5821
5967
60213
61543
621133
631971
642637
652543

[1,1,3,1,3,5,1,3,7,11,1,3,9,19,21,1,3,11,27,43,43,
 1,3,13,35,69,103,85,1,3,15,43,99,183,231,171,1,3,
 17,51,133,283,449,523,341,1,3,19,59,171,403,747,
 1107,1155,683,1,3,21,67,213,543,1133,1971,2637,
 2543]