Numbers k such that k and k^2 use only the digits 3, 5, 6, 7 and 9.

Terms

a(0) =3a(1) =6a(2) =63a(3) =76a(4) =5963a(5) =7576a(6) =9663a(7) =57756a(8) =57937a(9) =59663a(10) =75337a(11) =97956a(12) =753376a(13) =753656a(14) =759576a(15) =797956a(16) =797976a(17) =799736a(18) =967366a(19) =967976a(20) =977956a(21) =979663a(22) =5799736a(23) =5977756a(24) =5977956a(25) =5979663a(26) =7536337a(27) =7599576a(28) =9979663a(29) =57937376