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A261248 as a simple table

na(n)
11
21
31
41
57
61
723
81
91
107
111
12151
131
1447
151
16193
171
183383
197
201
21217
221
239041
2417
251
267
27161
281
2923
3020687
311
32119
33233
341
35437071
36617
371
387199
3920783
407
4117
42137
431
44593
451
46497
47731153
481839433
4979
501
51326471
527
532863

[1,1,1,1,7,1,23,1,1,7,1,151,1,47,1,193,1,3383,7,1,
 217,1,9041,17,1,7,161,1,23,20687,1,119,233,1,
 437071,617,1,7199,20783,7,17,137,1,593,1,497,
 731153,1839433,79,1,326471,7,2863]