def challenge138():
b1 = fibo()
b2 = fibo()
# Step b1 on
for i in xrange(2):
b1.next()
# Step b2 on
for i in xrange(5):
b2.next()
total = 0
for i in xrange(12):
next = b1.next() * b2.next()
v = ((next // 2)**2 + (next + 1)**2)**0.5
if v == int(v):
total += int(v)
else:
v = ((next // 2)**2 + (next - 1)**2)**0.5
if v == int(v):
total += int(v)
# Step on
for i in xrange(2):
b1.next(); b2.next()
return total
def challenge025():
for i, c in izip(fibo(), count(1)):
l = len(str(i))
if l > 999:
if l == 1000:
return c
else:
return
def challenge002():
numRange = takewhile(lambda i: i < 4000000, fibo())
evenNums = (i for i in numRange if (i % 2 == 0))
return sum(evenNums)
