Numbers k such that k*(k+4) gives the concatenation of two numbers m and m-3.

Terms

a(0) =8a(1) =98a(2) =426a(3) =571a(4) =725a(5) =844a(6) =998a(7) =7808a(8) =9998a(9) =36363a(10) =63634a(11) =99998a(12) =326732a(13) =673265a(14) =999998a(15) =4545452a(16) =5454545a(17) =9999998a(18) =47058821a(19) =52941176a(20) =99999998a(21) =331983805a(22) =332667332a(23) =384615384a(24) =422892896a(25) =475524475a(26) =524475522a(27) =577107101a(28) =615384613a(29) =667332665