def p44():
n = 2500
pent = pentagonal_n(1, n, 'dict')
pentSet = pentagonal_n(1, n, 'set')
print 'starting loop..'
for j in range(1, n):
for k in range(j, n):
if pent[k] - pent[j] in pentSet and pent[k] + pent[j] in pentSet:
print k, j, pent[k], pent[j]
return pent[k] - pent[j]
def p45():
n = 100000
t = triangular_n(1, n)
p = pentagonal_n(1, n)
h = hexagonal_n(1, n)
return set.intersection(t, p, h)