Number of positive integers <= 10^n that are divisible by no prime exceeding 19.

Terms

a(0) =1a(1) =10a(2) =72a(3) =331a(4) =1169a(5) =3419a(6) =8751a(7) =20198a(8) =42950a(9) =85411a(10) =160626a(11) =288126a(12) =496303a(13) =825326a(14) =1330766a(15) =2088013a(16) =3197529a(17) =4791093a(18) =7039193a(19) =10159603a(20) =14427309a(21) =20186026a(22) =27861175a(23) =37974797a(24) =51162295a(25) =68191379a(26) =89983125a(27) =117635672