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A221470 as a simple table

na(n)
01
15
23
37
415
5287
6191
7127
8223
9159
10143
1195
1263
1347
1431
1527
16703
176471
186383
194255
206887
214591
2250427
2347867
2431911
2577671
26161439
27113383
28239231
29159487
301027431
31974079
32730559
33487039
34432923
35288615
36270271
373041391
389158655
396416623
4016786431
4112589823

[1,5,3,7,15,287,191,127,223,159,143,95,63,47,31,
 27,703,6471,6383,4255,6887,4591,50427,47867,31911,
 77671,161439,113383,239231,159487,1027431,974079,
 730559,487039,432923,288615,270271,3041391,
 9158655,6416623,16786431,12589823]