/// <summary>
/// 由于除数数量很少，没有逐个判断是否是prime
/// </summary>
/// <param name="args"></param>
static void Main(string[] args)
{
FactorsGenerator generator = new FactorsGenerator();
List <long> factors = generator.GeneratorDistinctFactors(600851475143);
foreach (long factor in factors)
{
Console.Write(factor + ",");
}
Console.ReadLine();
}
static void Main(string[] args)
{
Stopwatch sw = new Stopwatch();
sw.Start();
FactorsGenerator fg = new FactorsGenerator();
float min = 1f / 3;
float max = 1f / 2;
FactMatrix = new int[MAXNUM + 1][];
for (int i = 0; i <= MAXNUM; i++)
{
FactMatrix[i] = fg.GeneratorDistinctFactors(i).ToArray();
}
;
sw.Stop();
Console.WriteLine("init base data time used {0}m{1}s{2}ms", sw.Elapsed.Minutes, sw.Elapsed.Seconds, sw.Elapsed.Milliseconds);
sw.Restart();
int result = 0;
for (int i = MAXNUM; i >= 2; i--)
{
// 计算小于此i数字所有的互质数
for (int j = 1; j < i; j++)
{
// 检查是不是互质数
if (!IsReltavePrime(i, j))
{
continue;
}
float val = (float)j / i;
if (val <= min)
{
continue;
}
if (val >= max)
{
continue;
}
result++;
}
// 统计在1/3 和 1/2的数字
}
sw.Stop();
Console.WriteLine("result is {0}, time used {1}m{2}s{3}ms", result, sw.Elapsed.Minutes, sw.Elapsed.Seconds, sw.Elapsed.Milliseconds);
}
static void Main(string[] args)
{
FactorsGenerator fg = new FactorsGenerator();
PrimeGenerator pg = new PrimeGenerator();
Queue <long> consecutives = new Queue <long>();
for (long num = 1000; ; num++)
{
List <long> factors = fg.GeneratorDistinctFactors(num);
if (factors.Count != 4)
{
continue;
}
bool allprime = true;
foreach (long factor in factors)
{
if (pg.CheckPrime((int)factor))
{
continue;
}
allprime = false;
break;
}
if (!allprime)
{
continue;
}
consecutives.Enqueue(num);
if (CheckConsecutive(consecutives, 4))
{
break;
}
if (consecutives.Count == 4)
{
consecutives.Dequeue();
}
}
Console.WriteLine(string.Format("Result is {0}", consecutives.Peek()));
}