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

Terms

a(0) =386a(1) =430a(2) =568a(3) =612a(4) =815a(5) =4522a(6) =5476a(7) =90911a(8) =316833a(9) =683165a(10) =3636365a(11) =6363633a(12) =82352943a(13) =331668333a(14) =368421054a(15) =395604392a(16) =442767755a(17) =461538463a(18) =488721801a(19) =511278197a(20) =538461535a(21) =557232243a(22) =604395606a(23) =631578944a(24) =668331665