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A271660 as a simple table

na(n)
15
217
3257
4317
5977
62237
73257
85189
98537
109533
1111717
1213367
1322937
1437847
1565537
1676871
17307397
18428957
19491537
20589409
21610913
22983777
231055063
241207097
251340789
261659587
272822717
283137357
293264887
303488333
314994117
325577827
336475457
347378373
357479089

[5,17,257,317,977,2237,3257,5189,8537,9533,11717,
 13367,22937,37847,65537,76871,307397,428957,
 491537,589409,610913,983777,1055063,1207097,
 1340789,1659587,2822717,3137357,3264887,3488333,
 4994117,5577827,6475457,7378373,7479089]