a(n) is the number of integers k less than 10^n such that the decimal representation of k lacks the digits 1,2,3,4, at least one of digits 5,6 and at least one of digits 7,8,9.
A126643
a(n) is the number of integers k less than 10^n such that the decimal representation of k lacks the digits 1,2,3,4, at least one of digits 5,6 and at least one of digits 7,8,9.
Terms
- a(0) =6a(1) =34a(2) =180a(3) =886a(4) =4116a(5) =18334a(6) =79260a(7) =335446a(8) =1398276a(9) =5765134a(10) =23581740a(11) =95900806a(12) =388345236a(13) =1567647934a(14) =6313474620a(15) =25382710966a(16) =101917608996a(17) =408831386734
External references
- oeis: A126643