Numbers k such that k concatenated with k-8 gives the product of two numbers which differ by 6.

Terms

a(0) =9a(1) =13a(2) =99a(3) =103a(4) =183a(5) =328a(6) =528a(7) =715a(8) =999a(9) =1003a(10) =6099a(11) =9999a(12) =10003a(13) =13224a(14) =40495a(15) =99999a(16) =100003a(17) =106755a(18) =453288a(19) =999999a(20) =1000003a(21) =2066115a(22) =2975208a(23) =9999999a(24) =10000003a(25) =22145328a(26) =28027683a(27) =99999999a(28) =100000003a(29) =110213248