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A275528 as a simple table

na(n)
13
213
397
4193
5241
6673
7769
812289
9786433
1022253377
1139714817
12152371201
13597688321
141107296257
153221225473
167348420609
1711560943617
1829796335617
1974490839041
2077309411329
21206158430209
22246423748609
23448203325441
242422022479873
255469640851457
2628114855919617

[3,13,97,193,241,673,769,12289,786433,22253377,
 39714817,152371201,597688321,1107296257,
 3221225473,7348420609,11560943617,29796335617,
 74490839041,77309411329,206158430209,246423748609,
 448203325441,2422022479873,5469640851457,
 28114855919617]