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A132449 as a simple table

na(n)
13
27
311
419
537
667
7131
8285
9529
101033
112053
124179
138219
1416427
1532771
1665581
17131081
18262183
19524327
201048585
212097157
224194307
238388641
2416777243
2533554441
2667108935
27134217767
28268435465
29536870917
301073741907
312147483657

[3,7,11,19,37,67,131,285,529,1033,2053,4179,8219,
 16427,32771,65581,131081,262183,524327,1048585,
 2097157,4194307,8388641,16777243,33554441,
 67108935,134217767,268435465,536870917,1073741907,
 2147483657]