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A277716 as a simple table

na(n)
13
27
315
431
563
6127
7219
8255
9291
10439
11511
12583
13819
14879
151023
161167
171443
181639
191747
201759
211915
222047
232115
242335
252887
263187
273279
283339
293495
303519
313831
324095
334231
344671
355043
365775
375995
386375
396559
406679
416991
427039
437323
447663
458191
468463
478931
489343
4910087
5010515
5111551
5211991
5312531
5412751
5512827
5613119
5713359
5813983
5914079
6014647
6115327
6216383

[3,7,15,31,63,127,219,255,291,439,511,583,819,879,
 1023,1167,1443,1639,1747,1759,1915,2047,2115,2335,
 2887,3187,3279,3339,3495,3519,3831,4095,4231,4671,
 5043,5775,5995,6375,6559,6679,6991,7039,7323,7663,
 8191,8463,8931,9343,10087,10515,11551,11991,12531,
 12751,12827,13119,13359,13983,14079,14647,15327,
 16383]