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A138006 as a simple table

na(n)
13
215
37
4341
5819
69709
72047
8475107
931
103233097
115461
128388607
133556769739
1431675383749
1565498251203
16575525617597
1734359738367
18549755813887
19182518930210733
202047
2137905296863701641
222251799813685247

[3,15,7,341,819,9709,2047,475107,31,3233097,5461,
 8388607,3556769739,31675383749,65498251203,
 575525617597,34359738367,549755813887,
 182518930210733,2047,37905296863701641,
 2251799813685247]