def is_deficient_prefect_abundant(a):
"""Returns:
-1 if number is deficient
0 if it's proper
1 if it's abundant"""
f = proper_factors(a)
d = sum(f) - a
if d > 0:
return 1
if d < 0:
return -1
return d
def fact(n):
try:
return d[n]
except KeyError:
d[n] = proper_factors(n)
return d[n]
