Smallest k such that d(phi(k)) - phi(d(k)) = -n, where d(k) = A000005(k) and phi(k) = A000010(k).

Terms

a(0) =240a(1) =120a(2) =960a(3) =6528a(4) =4080a(5) =1920a(6) =15360a(7) =24960a(8) =61440a(9) =13440a(10) =16320a(11) =87360a(12) =983040a(13) =196560a(14) =1432080a(15) =130560a(16) =861840a(17) =32640a(18) =98280a(19) =114240a(20) =2545920a(21) =293760a(22) =261120a(23) =967680a(24) =174720a(25) =2673216a(26) =4194240a(27) =1081080a(28) =1044480a(29) =913920