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, at least one of digits 6,7 and at least one of digits 8,9.
A126718
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, at least one of digits 6,7 and at least one of digits 8,9.
Terms
- a(0) =7a(1) =43a(2) =235a(3) =1171a(4) =5467a(5) =24403a(6) =105595a(7) =447091a(8) =1864027a(9) =7686163a(10) =31440955a(11) =127865011a(12) =517788187a(13) =2090186323a(14) =8417944315a(15) =33843570931a(16) =135890057947a(17) =545108340883
External references
- oeis: A126718