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A357898 as a simple table

na(n)
11
23
37
421
531
677
7127
8301
9783
101133
113399
124781
138191
1416637
1537367
16101601
17131071
18305837
19524287
201073581
213220743
224201133
238544103
2418404669
2534012327
2667139117
27135255431
28300528877
29824583699
301073862029
312147483647
324295564381
338603449703
3425807607829

[1,3,7,21,31,77,127,301,783,1133,3399,4781,8191,
 16637,37367,101601,131071,305837,524287,1073581,
 3220743,4201133,8544103,18404669,34012327,
 67139117,135255431,300528877,824583699,1073862029,
 2147483647,4295564381,8603449703,25807607829]