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A049479 as a simple table

na(n)
23
37
43
531
63
7127
83
97
103
1123
123
138191
143
157
163
17131071
183
19524287
203
217
223
2347
243
2531
263
277
283
29233
303
312147483647
323
337
343
3531
363
37223
383
397
403
4113367
423
43431
443
457
463
472351
483
49127
503
517
523
536361
543
5523
563
577
583
59179951
603
612305843009213693951
623
637
643
6531

[3,7,3,31,3,127,3,7,3,23,3,8191,3,7,3,131071,3,
 524287,3,7,3,47,3,31,3,7,3,233,3,2147483647,3,7,3,
 31,3,223,3,7,3,13367,3,431,3,7,3,2351,3,127,3,7,3,
 6361,3,23,3,7,3,179951,3,2305843009213693951,3,7,
 3,31]