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A125045 as a simple table

na(n)
13
25
317
4257
565537
6641
77
8318811
919
101747
1112791
1273
1390679
1467
1559
16113
1713
1841
1947
20151
21131
221301297155768795368671
2320921
241514878040967313829436066877903
255514151389810781513
26283
271063
283027041
2929
3024040758847310589568111822987
31154351
3289

[3,5,17,257,65537,641,7,318811,19,1747,12791,73,
 90679,67,59,113,13,41,47,151,131,
 1301297155768795368671,20921,
 1514878040967313829436066877903,
 5514151389810781513,283,1063,3027041,29,
 24040758847310589568111822987,154351,89]