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A239679 as a simple table

na(n)
07
113
231
391
4307
51123
64291
716771
866307
9263683
101051651
114200451
1216789507
1367133443
14268484611
151073840131
164295163907
1717180262403
1868720263171
19274879479811
201099514773507
214398052802563
2217592198627331
2370368769343491
24281475027042307
251125900007505923

[7,13,31,91,307,1123,4291,16771,66307,263683,
 1051651,4200451,16789507,67133443,268484611,
 1073840131,4295163907,17180262403,68720263171,
 274879479811,1099514773507,4398052802563,
 17592198627331,70368769343491,281475027042307,
 1125900007505923]