Number of k's less than or equal to 10^n such that there are no middle divisors of k (A071561).
A071540
Number of k's less than or equal to 10^n such that there are no middle divisors of k (A071561).
Terms
- a(0) =4a(1) =57a(2) =664a(3) =7068a(4) =73130a(5) =747244a(6) =7590269a(7) =76830140a(8) =775940042a(9) =7824134360
External references
- oeis: A071540