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A242389 as a simple table

na(n)
12
23
37
413
531
658
7127
8249
9508
101016
112047
124080
138191
1416374
1532759
1665521
17131071
18262123
19524287
201048554
212097141
224194290
238388607
2416777180
2533554426
2667108848
27134217715
28268435428
29536870911
301073741782
312147483647
324294967265
338589934577

[2,3,7,13,31,58,127,249,508,1016,2047,4080,8191,
 16374,32759,65521,131071,262123,524287,1048554,
 2097141,4194290,8388607,16777180,33554426,
 67108848,134217715,268435428,536870911,1073741782,
 2147483647,4294967265,8589934577]