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A187370 as a simple table

na(n)
11
23
31
45
59
63
721
83
91
1011
1113
125
1327
1427
157
165
1727
183
1927
2041
2113
2211
2349
245
2569
2683
2761
2847
299
3021
313
323
3345
3435
3521
3621
373
383
397
4039
419
423
4327
4451
4573
4635
4727
4833
4927
50125
51103
52255
5327
5463
55207
56171
57153
5827
593
60105
61147

[1,3,1,5,9,3,21,3,1,11,13,5,27,27,7,5,27,3,27,41,
 13,11,49,5,69,83,61,47,9,21,3,3,45,35,21,21,3,3,7,
 39,9,3,27,51,73,35,27,33,27,125,103,255,27,63,207,
 171,153,27,3,105,147]