Least positive integer k such that 3^n-1 and k^n-1 are relatively prime.

Terms

a(0) =2a(1) =2a(2) =2a(3) =10a(4) =2a(5) =28a(6) =2a(7) =10a(8) =2a(9) =22a(10) =10a(11) =910a(12) =2a(13) =2a(14) =2a(15) =170a(16) =2a(17) =3458a(18) =2a(19) =110a(20) =2a(21) =46a(22) =10a(23) =910a(24) =2a(25) =2a(26) =2a(27) =290a(28) =2a(29) =9548