static int countNDivisors ( int a , int b , int n ) {
  int x = ( int ) Math . sqrt ( b ) + 1 ;
  boolean [ ] primes = new boolean [ x + 1 ] ;
  sieve ( primes , x ) ;
  return nDivisors ( primes , x , a , b , n ) ;
}

static int countNDivisors ( int a , int b , int n ) { int x = ( int ) Math . sqrt ( b ) + 1 ; boolean [ ] primes = new boolean [ x + 1 ] ; sieve ( primes , x ) ; return nDivisors ( primes , x , a , b , n ) ; }
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