def lenth_of_fib(length):
index = 1
while True:
val = solutions.fib(index)
if len(str(val)) == length:
return val
index += 1
def first_fib_limit(limit):
"""
>>> first_fib_limit(100)
476
>>> first_fib_limit(3)
12
>>> first_fib_limit(1)
1
"""
cached = {}
index = 1
while True:
val = solutions.fib(index, cached)
if len(str(val)) == limit:
return index
cached[index] = val
index += 1
