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A371556 as a simple table

na(n)
24
34
47
59
68
78
831
933
1016
1116
12127
13129
1432
1532
16511
17513
1864
1964
202047
212049
22128
23128
248191
258193
26256
27256
2832767
2932769
30512
31512
32131071
33131073
341024
351024
36524287
37524289
382048
392048
402097151
412097153
424096
434096
448388607
458388609
468192
478192
4833554431
4933554433
5016384
5116384
52134217727
53134217729

[4,4,7,9,8,8,31,33,16,16,127,129,32,32,511,513,64,
 64,2047,2049,128,128,8191,8193,256,256,32767,
 32769,512,512,131071,131073,1024,1024,524287,
 524289,2048,2048,2097151,2097153,4096,4096,
 8388607,8388609,8192,8192,33554431,33554433,16384,
 16384,134217727,134217729]