Number of positive integers <= 10^n that are divisible by no prime exceeding 23.

Terms

a(0) =1a(1) =10a(2) =76a(3) =369a(4) =1385a(5) =4298a(6) =11654a(7) =28434a(8) =63768a(9) =133440a(10) =263529a(11) =495412a(12) =892644a(13) =1550012a(14) =2605342a(15) =4254753a(16) =6771752a(17) =10531080a(18) =16038303a(19) =23965659a(20) =35195450a(21) =50872227a(22) =72464493a(23) =101837746a(24) =141340075a(25) =193902062a(26) =263152095a(27) =353549942