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A100462 as a simple table

na(n)
11
21
31
43
57
625
749
8109
9229
10481
111003
122019
134051
148143
1516309
1632683
1765439
18131007
19262081
20524187
211048423
222097027
234194147
248388481
2516777039
2633554269
2767108699
28134217529
29268435227
30536870713
311073741607
322147483371
334294967043
348589934267
3517179868869

[1,1,1,3,7,25,49,109,229,481,1003,2019,4051,8143,
 16309,32683,65439,131007,262081,524187,1048423,
 2097027,4194147,8388481,16777039,33554269,
 67108699,134217529,268435227,536870713,1073741607,
 2147483371,4294967043,8589934267,17179868869]