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A307512 as a simple table

na(n)
13
25
313
417
541
667
7197
8257
9523
101031
112069
124129
138243
1416451
1532911
1665537
17131479
18262153
19524591
201048601
212097229
224194389
238388791
2416777441
2533554501
2667108913
27134217757
28268435889
29536871259
301073741971
312147484949
324294967297
338589934651
3417179869827

[3,5,13,17,41,67,197,257,523,1031,2069,4129,8243,
 16451,32911,65537,131479,262153,524591,1048601,
 2097229,4194389,8388791,16777441,33554501,
 67108913,134217757,268435889,536871259,1073741971,
 2147484949,4294967297,8589934651,17179869827]