gistfile1.txt

std::list<std::uint64_t> collatz_seq(std::uint64_t x)
{
    std::list<std::uint64_t> result;
    while (x > 1)
    {
        result.push_back(x);
        if (x % 2 == 0)
            x = x / 2;
        else
            x = 3 * x + 1;
    }
    result.push_back(x);
    return result;
}