Numbers k such that k*(k+9) gives the concatenation of two numbers m and m-9.
A116231
Numbers k such that k*(k+9) gives the concatenation of two numbers m and m-9.
Terms
- a(0) =7a(1) =63a(2) =42752a(3) =57240a(4) =75422a(5) =425071a(6) =574921a(7) =979527a(8) =4301392a(9) =5698600a(10) =7028665a(11) =4925000746a(12) =5074999246a(13) =7748266573a(14) =8511881483a(15) =8814851183
External references
- oeis: A116231