a(n) is the number of nonnegative integers k less than 10^n such that the decimal representation of k lacks the digits 1,2,3, at least one of digits 4,5 and at least one of digits 6,7,8,9.
A126635
a(n) is the number of nonnegative integers k less than 10^n such that the decimal representation of k lacks the digits 1,2,3, at least one of digits 4,5 and at least one of digits 6,7,8,9.
Terms
- a(0) =7a(1) =47a(2) =307a(3) =1943a(4) =11827a(5) =69287a(6) =392707a(7) =2166743a(8) =11703187a(9) =62168327a(10) =325983907a(11) =1692105143a(12) =8714154547a(13) =44600020967a(14) =227161443907
External references
- oeis: A126635