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A056208 as a simple table

na(n)
03
15
27
311
419
537
667
7131
8263
9523
101031
112053
124099
138209
1416421
1532771
1665539
17131101
18262147
19524341
201048583
212097169
224194371
238388619
2416777259
2533554473
2667108961
27134217757
28268435459
29536870923
301073741827
312147483659

[3,5,7,11,19,37,67,131,263,523,1031,2053,4099,
 8209,16421,32771,65539,131101,262147,524341,
 1048583,2097169,4194371,8388619,16777259,33554473,
 67108961,134217757,268435459,536870923,1073741827,
 2147483659]