Largest number m such that a^n == 1 (mod m) whenever a is coprime to m.

Terms

a(0) =2a(1) =24a(2) =2a(3) =240a(4) =2a(5) =504a(6) =2a(7) =480a(8) =2a(9) =264a(10) =2a(11) =65520a(12) =2a(13) =24a(14) =2a(15) =16320a(16) =2a(17) =28728a(18) =2a(19) =13200a(20) =2a(21) =552a(22) =2a(23) =131040a(24) =2a(25) =24a(26) =2a(27) =6960a(28) =2a(29) =171864