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A255161 as a simple table

na(n)
12
23
35
47
517
631
767
873
9107
10109
11127
12173
13191
14227
15257
16373
17701
181667
192293
204289
215189
226761
237517
247703
259103
2612547
2714891
2815083
2916319
3019433
3128807
3231727
3347653
3465537
3569313
3683269
3785093
3886293
39262657
40295433
41444713
42663571
431053953
441063613

[2,3,5,7,17,31,67,73,107,109,127,173,191,227,257,
 373,701,1667,2293,4289,5189,6761,7517,7703,9103,
 12547,14891,15083,16319,19433,28807,31727,47653,
 65537,69313,83269,85093,86293,262657,295433,
 444713,663571,1053953,1063613]