Least k such that A072084(k) = n.

Terms

a(0) =1a(1) =3a(2) =7a(3) =9a(4) =31a(5) =21a(6) =127a(7) =27a(8) =49a(9) =93a(10) =3583a(11) =63a(12) =8191a(13) =381a(14) =217a(15) =81a(16) =131071a(17) =147a(18) =524287a(19) =279a(20) =889a(21) =10749a(22) =14680063a(23) =189a(24) =961a(25) =24573a(26) =343a(27) =1143a(28) =1073479679a(29) =651