Least m coprime to 3 minimizing A007947(m*(3^n-m)).

Terms

a(0) =1a(1) =1a(2) =2a(3) =1a(4) =1a(5) =25a(6) =139a(7) =289a(8) =31a(9) =1a(10) =16096a(11) =49a(12) =7424a(13) =588665a(14) =619115a(15) =83521a(16) =8000000a(17) =1515625a(18) =505620842a(19) =17643776a(20) =244140625a(21) =5443635008