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Product features · Fast-doubling Fibonacci
01
FiboLantern supports discussion of exact Fibonacci pairs and their doubling identities, with index limits reviewed before large integer results are produced.
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Fast-doubling Fibonacci
● ● ●FiboLantern●
A concrete starting point · Fast-doubling Fibonacci ×
def fibonacci(index):
if type(index) is not int or not 0 <= index <= 10000:
raise ValueError("index.range")
a, b = 0, 1
for bit in bin(index)[2:]:
c = a * (2 * b - a)
d = a * a + b * b
a, b = (c, d) if bit == "0" else (d, c + d)
return a✳Compute Fibonacci numbers by fast doubling for integer indices from zero through 10000.
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