Numbers k such that k*(k+1) gives the concatenation of two numbers m and m+6.

Terms

a(0) =387a(1) =431a(2) =569a(3) =613a(4) =816a(5) =4523a(6) =5477a(7) =90912a(8) =316834a(9) =683166a(10) =3636366a(11) =6363634a(12) =82352944a(13) =331668334a(14) =368421055a(15) =395604393a(16) =442767756a(17) =461538464a(18) =488721802a(19) =511278198a(20) =538461536a(21) =557232244a(22) =604395607a(23) =631578945a(24) =668331666