🐚 Number Theory & Sacred Geometry

Fibonacci Sequence & Golden Ratio Calculator

Compute the $n^{\text{th}}$ Fibonacci number ($F_n$) using Binet's analytical formula, calculate Golden Section ($\phi \approx 1.6180339887$) proportions, and evaluate sequence ratios.

Sequence Position ($n$)
15th Fibonacci Number (F₁₅)
610
Ratio F₁₅ / F₁₄ = 1.618037 (Approaching φ)
Major Segment ($A$)
61.803
Minor Segment ($B$)
38.197
Lucas Number ($L_n$)
1,364
💡 Binet's Analytic Closed Form:

$$F_n = \frac{\phi^n - \psi^n}{\sqrt{5}} = \frac{(1.618034)^{15} - (-0.618034)^{15}}{2.236068} = 610$$

The Golden Ratio & Binet's Formula

The Fibonacci sequence is defined recursively by $F_0 = 0, F_1 = 1, F_n = F_{n-1} + F_{n-2}$: