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A076047 as a simple table

na(n)
12
23
35
47
513
617
741
8139
9151
10199
11271
12307
13751
141217
153343
163617
174001
184241
1940841
2097169
21117017
22203897
23746153
24123090449
25137542193
26256534591
2721249911167
2888109383889
29112332648583
3085726065193313
31226411321073393

[2,3,5,7,13,17,41,139,151,199,271,307,751,1217,
 3343,3617,4001,4241,40841,97169,117017,203897,
 746153,123090449,137542193,256534591,21249911167,
 88109383889,112332648583,85726065193313,
 226411321073393]