Number of values of k for which sigma(k) is a permutation of decimal digits of k, for 10^(n-1) < k < 10^n.
A216390
Number of values of k for which sigma(k) is a permutation of decimal digits of k, for 10^(n-1) < k < 10^n.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =10a(4) =47a(5) =200a(6) =842a(7) =4698a(8) =28831
External references
- oeis: A216390