static rt_uint32_t array1[ARRAY_LEN];
void func1(void)
{
    for (rt_uint32_t i = 1; i <= ARRAY_LEN; i++)
    {
        array1[i - 1] = 0;
    }

    rt_uint32_t x, y = 0, z = 0;
    rt_uint32_t i = 0;
    for (x = 2; x <= ARRAY_LEN; x++)
    {
        y = 0;
        for (i = 1; i <= x; i++)
        {
            if (x % i == 0)
            {
                y++;
            }
        }
        if (y == 2)
        {
            z++;
            array1[x - 1] = x;
        }
    }
    array1[0] = 1;
}

static rt_uint32_t array2[ARRAY_LEN];
void func2(void)
{
    for (rt_uint32_t i = 1; i <= ARRAY_LEN; i++)
    {
        array2[i - 1] = 0;
    }

    rt_uint32_t x, y = 0, z = 0;
    rt_uint32_t i = 0;
    for (x = 3; x <= ARRAY_LEN; x++)
    {
        y = 0;
        for (i = 2; i <= x / 2; i++)
        {
            if (x % i == 0)
            {
                y++;
                break;
            }
        }
        if (y == 0)
        {
            z++;
            array2[x - 1] = x;
        }
    }
    array2[0] = 1;
    array2[1] = 2;
}

static rt_uint32_t array3[ARRAY_LEN];
void func3(void)
{
    for (rt_uint32_t i = 1; i <= ARRAY_LEN; i++)
    {
        array3[i - 1] = 0;
    }

    rt_uint32_t x, y = 0, z = 0;
    rt_uint32_t i = 0;
    for (x = 3; x <= ARRAY_LEN; x += 2)
    {
        y = 0;
        for (i = 2; i <= x / 2; i++)
        {
            if (x % i == 0)
            {
                y++;
                break;
            }
        }
        if (y == 0)
        {
            z++;
            array3[x - 1] = x;
        }
    }
    array3[0] = 1;
    array3[1] = 2;
}

static rt_uint32_t array4[ARRAY_LEN];
void func4(void)
{
    for (rt_uint32_t i = 1; i <= ARRAY_LEN; i++)
    {
        array4[i - 1] = 0;
    }

    rt_uint32_t x, y = 0, z = 0;
    rt_uint32_t i = 0;
    for (x = 3; x <= ARRAY_LEN; x++)
    {
        y = 0;
        for (i = 2; i <= sqrt(x); i++)
        {
            if (x % i == 0)
            {
                y++;
                break;
            }
        }
        if (y == 0)
        {
            z++;
            array4[x - 1] = x;
        }
    }
    array4[0] = 1;
    array4[1] = 2;
}

static rt_uint32_t array5[ARRAY_LEN];
void func5(void)
{
    for (rt_uint32_t i = 1; i <= ARRAY_LEN; i++)
    {
        array5[i - 1] = 0;
    }

    rt_uint32_t x, y = 0, z = 0;
    rt_uint32_t i = 0;
    for (x = 3; x <= ARRAY_LEN; x += 2)
    {
        y = 0;
        for (i = 2; i <= sqrt(x); i++)
        {
            if (x % i == 0)
            {
                y++;
                break;
            }
        }
        if (y == 0)
        {
            z++;
            array5[x - 1] = x;
        }
    }
    array5[0] = 1;
    array5[1] = 2;
}

static rt_uint32_t array6[ARRAY_LEN];
void func6(void)
{
    for (rt_uint32_t i = 1; i <= ARRAY_LEN; i += 2)
    {
        array6[i - 1] = i;
    }

    for (rt_uint32_t i = 3; i < sqrt(ARRAY_LEN); i+=2)
    {
        if (array6[i-1])
        {
            for(rt_uint32_t j=i<<2;j<=ARRAY_LEN;j+=i)
            {
                array6[j] = 0;
            }
        }
    }
    array6[1] = 2;
}