a(n) is the number of nonnegative integers k less than 10^n such that the decimal representation of k lacks at least one of the digits 1,2,3,4 and at least one of the digits 5,6,7,8,9.
A125904
a(n) is the number of nonnegative integers k less than 10^n such that the decimal representation of k lacks at least one of the digits 1,2,3,4 and at least one of the digits 5,6,7,8,9.
Terms
- a(0) =10a(1) =100a(2) =1000a(3) =9976a(4) =98920a(5) =971440a(6) =9420400a(7) =90005176a(8) =846101080a(9) =7822770880a(10) =71163913600a(11) =637585923976
External references
- oeis: A125904