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A340870 as a simple table

na(n)
13
27
313
431
5113
661
7193
8211
9181
10241
1113313
12421
1312289
142113
151009
161321
172424833
181801
19786433
202161
214801
2215361
23155189249
242521
256481
2661441
276301
288641
293489660929
3012241
313221225473
327561
3364513
341376257
3558321
3612601
37206158430209
388650753
39184321

[3,7,13,31,113,61,193,211,181,241,13313,421,12289,
 2113,1009,1321,2424833,1801,786433,2161,4801,
 15361,155189249,2521,6481,61441,6301,8641,
 3489660929,12241,3221225473,7561,64513,1376257,
 58321,12601,206158430209,8650753,184321]