def shareDivisors(n1, n2):
smallest = n1 if n1 < n2 else n2
largest = n2 if n1 < n2 else n1
for d in [d for d in divisors(smallest, True) if d > 1]:
if largest % d == 0:
return True
return False
def getDivisors(n, known = dict()):
if n in known:
return known[n]
d = list(divisors(n, True))
known[n] = d
return d
def challenge021():
maximum = 10000
total = 0
dict = {}
for a in xrange(1, maximum):
# Get the divisors total
b = 0
for d in divisors(a, False):
b += d
if a != b:
# Is the number already defined?
if dict.has_key(b):
if dict[b] == a:
# Add the pair
total += a + b
# Add the sum to the dictionary
dict[a] = b
return total
def squareSum(n):
return sum(i**2 for i in divisors(n, True))
