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A347512 as a simple table

na(n)
16
27
311
419
535
667
7131
8259
9515
101027
112051
124099
138195
1416387
1532771
1665539
17131075
18262147
19524291
201048579
212097155
224194307
238388611
2416777219
2533554435
2667108867
27134217731
28268435459
29536870915
301073741827
312147483651
324294967299
338589934595

[6,7,11,19,35,67,131,259,515,1027,2051,4099,8195,
 16387,32771,65539,131075,262147,524291,1048579,
 2097155,4194307,8388611,16777219,33554435,
 67108867,134217731,268435459,536870915,1073741827,
 2147483651,4294967299,8589934595]