For n > 1, a(n) is the least number > 0 for which it takes n-2 steps to reach a squarefree number by applying arithmetic derivative (A003415) zero or multiple times. a(1) = 4 is the least number for which no squarefree number is ever reached.
A328302
For n > 1, a(n) is the least number > 0 for which it takes n-2 steps to reach a squarefree number by applying arithmetic derivative (A003415) zero or multiple times. a(1) = 4 is the least number for which no squarefree number is ever reached.
Terms
- a(0) =4a(1) =1a(2) =9a(3) =50a(4) =306a(5) =5831a(6) =20230a(7) =52283a(8) =286891a(9) =10820131a(10) =38452606
External references
- oeis: A328302