void operator()( const tbb::blocked_range<Number>& r ) const {
     for( Number i=r.begin(); i!=r.end(); ++i ) {
         if( i%2 && is_prime(i) ) {
             Primes[Primes.grow_by(1)] = i;
         }
     }
 }
    void operator()( const tbb::blocked_range<Number>& r ) const {
        for( Number i=r.begin(); i!=r.end(); ++i ) { 
            if( i%2 && is_prime(i) ) {
#if TBB_DEPRECATED
                Primes[Primes.grow_by(1)] = i;
#else
                Primes.push_back( i );
#endif
            }
        }
    }