Numbers k such that k and k^2 use only the digits 0, 1, 5, 6 and 9.

Terms

a(0) =0a(1) =1a(2) =10a(3) =100a(4) =1000a(5) =10000a(6) =10916a(7) =100000a(8) =109119a(9) =109160a(10) =956619a(11) =1000000a(12) =1091190a(13) =1091600a(14) =9566190a(15) =9569199a(16) =9959501a(17) =10000000a(18) =10911900a(19) =10916000a(20) =95661699a(21) =95661900a(22) =95691990a(23) =99595010a(24) =100000000a(25) =109091666a(26) =109119000a(27) =109160000a(28) =956616990a(29) =956619000