Least number x such that x^n has n digits equal to k. Case k = 7.

Terms

a(0) =7a(1) =76a(2) =83a(3) =118a(4) =206a(5) =959a(6) =1083a(7) =726a(8) =1387a(9) =1114a(10) =3313a(11) =4011a(12) =2184a(13) =3881a(14) =4792a(15) =13071a(16) =11564a(17) =15523a(18) =9208a(19) =15232a(20) =17771a(21) =46336a(22) =33815a(23) =39147a(24) =18083a(25) =27624a(26) =63435a(27) =77276a(28) =24354a(29) =92341