Project Euler #47

euler47.py

from itertools import count, islice
from operator import and_

def factorise(n):
    result = []
    check = 2
    while (check * check <= n):
        if n % check == 0:
            result.append(check)
            n /= check
        else:
            check += 1
    if n != 1:
        result.append(n)
    return set(result)

print (i for i in count(1)
            if reduce(and_, map(lambda x: len(x) == 4,
                map(factorise, islice(count(i), 4))))).next()