Numbers k such that k and k^2 use only the digits 3, 5, 6, 7 and 8.

Terms

a(0) =6a(1) =76a(2) =766a(3) =876a(4) =7666a(5) =8566a(6) =8756a(7) =8876a(8) =57756a(9) =76576a(10) =76666a(11) =85666a(12) =753576a(13) =766576a(14) =766666a(15) =856666a(16) =7587856a(17) =7666576a(18) =7666666a(19) =8566666a(20) =8576576a(21) =8765766a(22) =75336356a(23) =76666576a(24) =76666666a(25) =85666666a(26) =87558876a(27) =88536356a(28) =577558376a(29) =577566756