Position of 210^n among 7-smooth numbers A002473.

Terms

a(0) =1a(1) =68a(2) =547a(3) =2119a(4) =5817a(5) =13008a(6) =25412a(7) =45078a(8) =74409a(9) =116147a(10) =173379a(11) =249532a(12) =348375a(13) =474018a(14) =630922a(15) =823885a(16) =1058051a(17) =1338898a(18) =1672260a(19) =2064302a(20) =2521535a(21) =3050825a(22) =3659361a(23) =4354687a(24) =5144682a(25) =6037582a(26) =7041946a(27) =8166692a(28) =9421074a(29) =10814695