Python ile Project Euler Soru 25 Çözümü

Soru 25:

The Fibonacci sequence is defined by the recurrence relation:

F_n = F_n−1 + F_n−2, where F₁ = 1 and F₂ = 1.

Hence the first 12 terms will be:

F₁ = 1
F₂ = 1
F₃ = 2
F₄ = 3
F₅ = 5
F₆ = 8
F₇ = 13
F₈ = 21
F₉ = 34
F₁₀ = 55
F₁₁ = 89
F₁₂ = 144

The 12th term, F₁₂, is the first term to contain three digits.

What is the index of the first term in the Fibonacci sequence to contain 1000 digits?

sayac, a, b = 3, 1, 1

while len(str(a+b))<1000:
    sayac += 1
    a, b = b, (a+b)
print(a, "\n", b, "\n", len(str(a+b)), "\n", sayac)