Numbers k such that k and k^2 use only the digits 0, 3, 5, 6 and 7.

Terms

a(0) =0a(1) =6a(2) =60a(3) =76a(4) =600a(5) =760a(6) =6000a(7) =7306a(8) =7600a(9) =55076a(10) =57756a(11) =60000a(12) =73060a(13) =76000a(14) =550760a(15) =577560a(16) =600000a(17) =730600a(18) =760000a(19) =5507600a(20) =5536756a(21) =5775600a(22) =6000000a(23) =6055306a(24) =7306000a(25) =7600000a(26) =7770306a(27) =55076000a(28) =55077766a(29) =55367560