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A056420 as a simple table

na(n)
13
23
37
415
521
679
775
8306
9433
101605
111695
1212662
1310461
1457759
15122791
16347895
17476049
183596917
193401967
2022005312
2141597289
22142675887
23186077883
241476684552
251694657979
268147271993
2715690973311

[3,3,7,15,21,79,75,306,433,1605,1695,12662,10461,
 57759,122791,347895,476049,3596917,3401967,
 22005312,41597289,142675887,186077883,1476684552,
 1694657979,8147271993,15690973311]