Run it without reading it and see if you can solve the relation between the numbers

riddle.py

# Run with python 2 and try to guess the relationsihp between the numbers

def stringify(num):
    result = ""
    if num == 0:
        return "zero"
    if num < 0:
        result += "negative "
        num = -num
    english = ("", "one", "two", "three", "four", "five", "six", "seven",
               "eight", "nine")
    teens = ("", "eleven", "twelve", "thirteen", "fourteen", "fifteen",
             "sixteen", "seventeen", "eighteen", "nineteen")
    tens = ("", "ten", "twenty", "thirty", "forty", "fifty", "sixty",
            "seventy", "eighty", "ninety")
    if num >= 1000:
        if 11000 <= num < 20000:
            result += teens[num // 1000 - 10]
        else:
            if num >= 10000:
                result += tens[num // 10000] + ' '
            result += english[num % 10000 // 1000]
        result += " thousand "
        num %= 1000
    if num >= 100:
        result += english[num // 100] + " hundred "
        num %= 100
    if 11 <= num < 20:
        result += teens[num - 10]
    else:
        if num >= 10:
            result += tens[num // 10] + ' '
        result += english[num % 10]
    return result


def sequence(num, showChain=False):
    times = 0
    while True:
        size = len(stringify(num).replace(' ', ''))
        if num == size:
            if showChain:
                print num, "is perfect!"
            return times
        if showChain:
            print num, "is", size
        num = size
        times += 1


while True:
    sequence(int(raw_input("Give me a number: ")), True)
    print