Final prime of first member of A019518 that is divisible by 3^n.

Terms

a(0) =29a(1) =71a(2) =71a(3) =239a(4) =239a(5) =239a(6) =13001a(7) =50333a(8) =50333a(9) =374893a(10) =1831913a(11) =1831913a(12) =3836171a(13) =8467523a(14) =8467523a(15) =171374563a(16) =2260865401a(17) =2260865401a(18) =2260865401a(19) =2260865401a(20) =2260865401