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A227984 as a simple table

na(n)
01
13
21
37
41
51
615
77
83
91
1031
115
121
131
141
1563
1631
1715
187
193
201
21127
2221
2331
241
257
261
271
28255
29127
309
3131
3215
331
343
351
36511
3785
38127
3921
401
415
427
431
441
451023
46511
47255
48127
4963
5031
5115
527
533
541
552047
56341
5773
5817
59127
601
6131
621
631
641
651
664095
672047
681023

[1,3,1,7,1,1,15,7,3,1,31,5,1,1,1,63,31,15,7,3,1,
 127,21,31,1,7,1,1,255,127,9,31,15,1,3,1,511,85,
 127,21,1,5,7,1,1,1023,511,255,127,63,31,15,7,3,1,
 2047,341,73,17,127,1,31,1,1,1,1,4095,2047,1023]