Numbers k such that k * (digit complement of k) is a square.

Terms

a(0) =0a(1) =9a(2) =99a(3) =972a(4) =999a(5) =9900a(6) =9999a(7) =39024a(8) =60975a(9) =99999a(10) =168399a(11) =307692a(12) =467775a(13) =532224a(14) =692307a(15) =831600a(16) =972972a(17) =999999a(18) =9946224a(19) =9999999a(20) =11678832a(21) =12328767a(22) =18797427a(23) =19584972a(24) =32618124a(25) =42245775a(26) =47819475a(27) =52180524a(28) =57754224a(29) =67381875