Least number x such that x^n has n digits equal to k. Case k = 2.

Terms

a(0) =2a(1) =15a(2) =138a(3) =255a(4) =186a(5) =289a(6) =418a(7) =2619a(8) =1846a(9) =1532a(10) =2551a(11) =3142a(12) =3235a(13) =10567a(14) =5755a(15) =14083a(16) =10481a(17) =10399a(18) =18565a(19) =11703a(20) =33933a(21) =17668a(22) =36766a(23) =38724a(24) =37841a(25) =35933a(26) =67309a(27) =83236a(28) =69451a(29) =57508