Numbers k such that k concatenated with k-4 gives the product of two numbers which differ by 5.
A116130
Numbers k such that k concatenated with k-4 gives the product of two numbers which differ by 5.
Terms
- a(0) =8a(1) =98a(2) =590a(3) =738a(4) =830a(5) =998a(6) =1080a(7) =4508a(8) =9998a(9) =20660a(10) =29754a(11) =99998a(12) =980300a(13) =999998a(14) =6694218a(15) =9999998a(16) =49826988a(17) =99999998a(18) =117738578a(19) =131505858a(20) =132231404a(21) =176445054a(22) =177285320a(23) =247979808a(24) =252028388a(25) =335180054a(26) =336337790
External references
- oeis: A116130