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A067908 as a simple table

na(n)
12
23
35
47
511
613
729
847
9101
10257
11349
121201
131907
143533
15122449
16360233
17420271
189172043
1910700717
2011015860931
21825141735599
228577010309290077
2325232684617711471
2434344487396329503
2563627402961872791

[2,3,5,7,11,13,29,47,101,257,349,1201,1907,3533,
 122449,360233,420271,9172043,10700717,11015860931,
 825141735599,8577010309290077,25232684617711471,
 34344487396329503,63627402961872791]