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A181419 as a simple table

na(n)
13
27
317
447
52207
65777
715005
84870847
9598364773
10192900153617
1123725150497407
12792070839820228500005
1397415813466381445596089
14562882766124611619513723647
15400009475456580321242184872389193

[3,7,17,47,2207,5777,15005,4870847,598364773,
 192900153617,23725150497407,792070839820228500005,
 97415813466381445596089,
 562882766124611619513723647,
 400009475456580321242184872389193]