Minimal value of A007947(m*(3^n-m)) with m coprime to 3.

Terms

a(0) =2a(1) =2a(2) =10a(3) =10a(4) =22a(5) =110a(6) =278a(7) =238a(8) =1054a(9) =1342a(10) =11066a(11) =6118a(12) =18734a(13) =107030a(14) =557270a(15) =163030a(16) =1440430a(17) =2195110a(18) =11016290a(19) =3641210a(20) =23250370a(21) =38188766