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A271314 as a simple table

na(n)
33
45
511
67
743
817
919
1031
11683
1213
132731
14127
15331
16257
1743691
1873
19174763
2041
215419
22683
232796203
24241
254051
268191
2787211
28127
293033169
30331
31715827883
3265537
3320857
34131071
3586171
36109
3725781083
38524287
3922366891
4061681
418831418697
425419
432932031007403
442113
4518837001

[3,5,11,7,43,17,19,31,683,13,2731,127,331,257,
 43691,73,174763,41,5419,683,2796203,241,4051,8191,
 87211,127,3033169,331,715827883,65537,20857,
 131071,86171,109,25781083,524287,22366891,61681,
 8831418697,5419,2932031007403,2113,18837001]