This idea is really really impressive. At first glance, I have no idea of the algorithm, until I noticed that 30=2x3x5 and 2,3,5 are prime numbers. Wow, awesome, the author use prime factorization of an integer to complete the logic of algorithm. Imagine that there is a list consisting numbers 2, 3, More

Wow, enumerate algorithm, not efficient but very simple and clear! Thanks! More

Great idea. Function lower(), upper and isalpha() to check the character requirements, and list slice operation the check the length requirement. More