Least multiple m of n such that both m and m/n belong to A031443, or -1 if there is no such m.

Terms

a(0) =2a(1) =-1a(2) =147a(3) =-1a(4) =10a(5) =12a(6) =3745a(7) =-1a(8) =34587a(9) =8990a(10) =539a(11) =2364a(12) =156a(13) =728a(14) =135a(15) =-1a(16) =153a(17) =180a(18) =38a(19) =180a(20) =42a(21) =44a(22) =805a(23) =216a(24) =50a(25) =52a(26) =3969a(27) =56a(28) =62089a(29) =62850