Least k such that n^k mod k = n-1.

Terms

a(0) =2929a(1) =137243a(2) =4769a(3) =4021227877a(4) =387497a(5) =7342733a(7) =22963573117a(8) =18659a(9) =120593747a(10) =13757837a(11) =17651a(12) =17149a(13) =16584420001a(14) =613024059983a(15) =407a(16) =39959a(17) =559a(18) =581831a(19) =305197a(20) =235a(21) =459207143a(22) =855782591a(23) =106709a(24) =17678421233a(25) =240055a(26) =11227