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A105604 as a simple table

na(n)
11
21
31
41
51
63
71
85
93
1011
111
12105
131
1443
1533
1685
171
181197
191
201705
21129
22683
231
2423205
2511
262731
27171
2827305
291
302370291
311
3221845
332049
3443691
35473
365679765
371
38174763
398193
405941925
411
42621456339
431
446990505
45622611
462796203
471
481437248085
4943
50346729141
51131073
52111848105
531
5422861753173
557513
561521134245

[1,1,1,1,1,3,1,5,3,11,1,105,1,43,33,85,1,1197,1,
 1705,129,683,1,23205,11,2731,171,27305,1,2370291,
 1,21845,2049,43691,473,5679765,1,174763,8193,
 5941925,1,621456339,1,6990505,622611,2796203,1,
 1437248085,43,346729141,131073,111848105,1,
 22861753173,7513,1521134245]