def problem_25():
"""
F1 = 1
F2 = 1
F3 = 2
...
What is the first term in the Fibonacci sequence to contain 1000 digits?
"""
i = 0
for f in elib.fib():
i += 1
if (len(str(f)) >= 1000):
return i
def problem_2():
return sum(elib.conditioned_generator(elib.filtered_generator(elib.fib(), lambda x: x % 2 == 0), lambda x: x < 4000000))
