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A002184 as a simple table

na(n)
01
17
231
3127
473
523
68191
7151
8131071
9524287
10337
1147
12601
13262657
14233
152147483647
16599479
1771
18223
1979
2013367
21431
22631
232351
244432676798593
25103
266361
27881
2832377
29179951
302305843009213693951
3192737
32145295143558111
33193707721
3410052678938039
35228479
36439
37100801
38581283643249112959
392687
402593
41167

[1,7,31,127,73,23,8191,151,131071,524287,337,47,
 601,262657,233,2147483647,599479,71,223,79,13367,
 431,631,2351,4432676798593,103,6361,881,32377,
 179951,2305843009213693951,92737,145295143558111,
 193707721,10052678938039,228479,439,100801,
 581283643249112959,2687,2593,167]