Numbers k such that k*(k+6) gives the concatenation of two numbers m and m-5.

Terms

a(0) =6a(1) =96a(2) =450a(3) =545a(4) =688a(5) =853a(6) =996a(7) =4379a(8) =5616a(9) =9996a(10) =72727a(11) =99996a(12) =346530a(13) =653465a(14) =999996a(15) =9090905a(16) =9999996a(17) =94117643a(18) =99999996a(19) =334665330a(20) =336032384a(21) =378253325a(22) =390977439a(23) =439928488a(24) =483516483a(25) =516483512a(26) =560071507