The largest prime divisor

Rule

Each term is: The number's largest prime divisor

Known as: The largest prime divisor

The largest prime divisor of n.

The first 50 terms (starting from n=2) are:

2 3 2 5 3 7 2 3 5 11 3 13 7 5 2 17 3 19 5 7 11 23 3 5 13 3 7 29 5 31 2 11 17 7 3 37 19 13 5 41 7 43 11 5 23 47 3 7 5 17

Example

To get the value for n=22:

  • Find the number's largest prime divisor, giving 11.

So the result is 11.