Least inverse of A001390, or 0 if no inverse exists.

Terms

a(0) =2a(1) =7a(2) =11a(3) =5a(4) =89a(5) =73a(6) =31a(7) =0a(8) =43a(9) =601a(10) =3343a(11) =109a(12) =2383a(13) =997a(14) =1021a(15) =0a(16) =577a(17) =2441a(18) =3673a(19) =11149a(20) =5737a(21) =3373a(22) =6793a(23) =721051a(24) =1093a(25) =37507a(26) =0a(27) =52189a(28) =15361a(29) =58237