a(n) = smallest m such that A187824(m) = n, or -1 if A187824 never takes the value n.

A220890

a(n) = smallest m such that A187824(m) = n, or -1 if A187824 never takes the value n.

Terms

    a(0) =-1a(1) =-1a(2) =-1a(3) =2a(4) =3a(5) =4a(6) =5a(7) =29a(8) =41a(9) =55a(10) =71a(11) =881a(12) =791a(13) =9360a(14) =10009a(15) =1079a(16) =30239a(17) =-1a(18) =246960a(19) =-1a(20) =636481a(21) =1360800a(22) =3160079a(23) =-1a(24) =2162161

External references