Numbers k such that phi(prime(k)-1) == 0 (mod k).

Terms

a(0) =1a(1) =12a(2) =540a(3) =1024a(4) =1072a(5) =1092a(6) =1320a(7) =1408a(8) =4272a(9) =16200a(10) =29568a(11) =40082a(12) =43740a(13) =56592a(14) =123192a(15) =251736a(16) =265440a(17) =276000a(18) =664320a(19) =725760a(20) =758560a(21) =771264a(22) =2101248a(23) =3195192a(24) =6592704a(25) =7243050a(26) =7464960a(27) =8755680a(28) =10553502a(29) =11715840