Numbers k such that k concatenated with k-6 gives the product of two numbers which differ by 5.

Terms

a(0) =10a(1) =12a(2) =100a(3) =102a(4) =132a(5) =406a(6) =510a(7) =852a(8) =1000a(9) =1002a(10) =7930a(11) =10000a(12) =10002a(13) =66942a(14) =100000a(15) =100002a(16) =113322a(17) =440056a(18) =1000000a(19) =1000002a(20) =5289256a(21) =10000000a(22) =10000002a(23) =58477510a(24) =100000000a(25) =100000002a(26) =111333222a(27) =164378892a(28) =183673470