Smallest k > 1 such that k^n has k as its middle digits, or 0 if no such k exists.

Terms

a(0) =2a(1) =50a(2) =50a(3) =60a(4) =70a(5) =6a(6) =2a(7) =7600a(8) =47a(9) =5a(10) =4a(11) =93a(12) =6a(13) =34a(14) =5a(15) =9600a(16) =71a(17) =4a(18) =74a(19) =320a(20) =3a(21) =372a(22) =13a(23) =846a(24) =32a(25) =9600a(26) =339a(27) =9765a(28) =202a(29) =3