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A007670 as a simple table

na(n)
13
27
347
473
579
6113
7151
8167
9239
10241
11353
12367
13457
141367
153041
1627529
1749207
18160423
19364289
20991961
211203793
221667321
234792057

[3,7,47,73,79,113,151,167,239,241,353,367,457,
 1367,3041,27529,49207,160423,364289,991961,
 1203793,1667321,4792057]