3531is a value of n for which φ(n) = φ(n-2) - φ(n-1).
The totient function
is defined as the number of positive integers that are relatively
prime to (i.e., do not contain any factor in common with) , where 1 is counted
as being relatively prime to all numbers.
is defined as the number of positive integers 
that are relatively
prime to (i.e., do not contain any factor in common with) 
, where 1 is counted
as being relatively prime to all numbers. 
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