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A076994 as a simple table

na(n)
12
23
35
47
513
623
743
885
9167
10331
11661
121321
132641
145281
1510561
1621121
1742241
1884481
19168961
20337921
21675841
221351681
232703361
245406721
2510813441
2621626881
2743253761
2886507521
29173015041
30346030081
31692060161
321384120321
332768240641

[2,3,5,7,13,23,43,85,167,331,661,1321,2641,5281,
 10561,21121,42241,84481,168961,337921,675841,
 1351681,2703361,5406721,10813441,21626881,
 43253761,86507521,173015041,346030081,692060161,
 1384120321,2768240641]