Number of values of k for which phi(k) is a permutation of decimal digits of k, for 10^(n-1) < k < 10^n.
A216387
Number of values of k for which phi(k) is a permutation of decimal digits of k, for 10^(n-1) < k < 10^n.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =16a(4) =57a(5) =325a(6) =1666a(7) =9787a(8) =58979a(9) =366329
External references
- oeis: A216387