Least positive integer k such that 5^n-1 and k^n-1 are relatively prime.

Terms

a(0) =2a(1) =6a(2) =2a(3) =6a(4) =2a(5) =42a(6) =2a(7) =6a(8) =2a(9) =132a(10) =2a(11) =546a(12) =2a(13) =12a(14) =6a(15) =102a(16) =2a(17) =798a(18) =2a(19) =198a(20) =2a(21) =138a(22) =2a(23) =546a(24) =2a(25) =6a(26) =2a(27) =348a(28) =2a(29) =85932