Least k such that A056100(k) = n or -1 if no such k exists.

Terms

a(0) =6a(1) =124357252657a(2) =4a(3) =33a(4) =8a(5) =145a(6) =9a(7) =37063859a(8) =16a(9) =51a(10) =26a(11) =1441a(12) =15a(13) =2353a(14) =34a(15) =69a(16) =20a(18) =27a(19) =7201a(20) =25a(21) =87a(22) =115a(23) =9911837a(24) =56a(25) =385a(26) =58a(27) =45a(28) =62a(29) =86125529a(30) =57