Number of values of k for which sigma(k)-k is a permutation of decimal digits of k, for 10^(n-1) < k < 10^n.
A216386
Number of values of k for which sigma(k)-k is a permutation of decimal digits of k, for 10^(n-1) < k < 10^n.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =10a(4) =40a(5) =215a(6) =1224a(7) =6587a(8) =3387628a(9) =50507498
External references
- oeis: A216386