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A218388 as a simple table

na(n)
11
23
33
47
55
67
77
815
911
1015
1111
1215
1313
1415
1515
1631
1717
1831
1919
2031
2123
2231
2323
2431
2529
2631
2727
2831
2929
3031
3131
3263
3343
3451
3539
3663
3737
3855
3947
4063
4141
4263
4343
4463
4547
4663
4747
4863
4955
5063
5151
5263
5353
5463
5563
5663
5759
5863
5959
6063
6161
6263
6363
64127
6577
66127

[1,3,3,7,5,7,7,15,11,15,11,15,13,15,15,31,17,31,
 19,31,23,31,23,31,29,31,27,31,29,31,31,63,43,51,
 39,63,37,55,47,63,41,63,43,63,47,63,47,63,55,63,
 51,63,53,63,63,63,59,63,59,63,61,63,63,127,77,127]