Least k such that s(k)=n, where s=A030727.

Terms

a(0) =2a(1) =4a(2) =1a(3) =12a(4) =8a(5) =10a(6) =13a(7) =18a(8) =16a(9) =25a(10) =34a(11) =23a(12) =44a(13) =182a(14) =32a(15) =58a(16) =73a(17) =43a(18) =109a(19) =129a(20) =56a(21) =151a(22) =152a(23) =71a(24) =202a(25) =176a(26) =88a(27) =204a(28) =203a(29) =107