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A081091 as a simple table

na(n)
17
211
313
419
537
641
767
873
997
10131
11137
12193
13521
14577
15641
16769
171033
181153
192053
202081
212113
224099
234129
248209
2512289
2616417
2718433
2832771
2932801
3032833
3140961
3265539
33133121
34147457
35163841
36262147
37262153
38262657
39270337
40524353
41524801

[7,11,13,19,37,41,67,73,97,131,137,193,521,577,
 641,769,1033,1153,2053,2081,2113,4099,4129,8209,
 12289,16417,18433,32771,32801,32833,40961,65539,
 133121,147457,163841,262147,262153,262657,270337,
 524353,524801]