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A256145 as a simple table

na(n)
12
217
341
4257
5313
61297
71201
8241
9193
1073
11137
127321
1389
14233
1514281
16937
171489
1865537
1941761
20113
21929
223833
23160001
2497241
253209
26139921
27331777
2811489
2926881
306481
31614657
32353641
333361
34409
351129
3661681
3797
386113
391336337
40750313
4198801
4210529
4350857

[2,17,41,257,313,1297,1201,241,193,73,137,7321,89,
 233,14281,937,1489,65537,41761,113,929,3833,
 160001,97241,3209,139921,331777,11489,26881,6481,
 614657,353641,3361,409,1129,61681,97,6113,1336337,
 750313,98801,10529,50857]