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A027728 as a simple table

na(n)
15
27
311
477
5161
6707
75555
816261
950405
1053135
117570757
1211988911
1316100161
1416544561
15162626261
16502858205
17758919857
18793464397
1911092829011
2011539593511
215560873780655
227424090904247
237702753572077
2416515222251561
2557293477439275
267246424554246427

[5,7,11,77,161,707,5555,16261,50405,53135,7570757,
 11988911,16100161,16544561,162626261,502858205,
 758919857,793464397,11092829011,11539593511,
 5560873780655,7424090904247,7702753572077,
 16515222251561,57293477439275,7246424554246427]