Number of values of k for which sigma(k) is a permutation of decimal digits of k, for k < 10^n.
A216389
Number of values of k for which sigma(k) is a permutation of decimal digits of k, for k < 10^n.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =17a(4) =64a(5) =264a(6) =1106a(7) =5804a(8) =34635a(9) =213302
External references
- oeis: A216389