🐚 Fibonacci Generator

Generate the first N terms of the Fibonacci (or Lucas) sequence, or jump straight to a single huge nth term with BigInt precision. See the golden-ratio convergence, digit counts, and sum. No server — everything runs in your browser.

Parameters

Number of terms / nth index

Sequence

Max 10,000 terms. Terms beyond ~20,000 digits get very large fast — but BigInt can still handle them.

Statistics

Last term F(n)

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Number of digits in F(n)

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Sum of first n terms

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Ratio F(n)/F(n−1) (φ)

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Nth Term (fast doubling)

Compute a single term without generating the whole sequence — works in O(log n).

Direct F(n)

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Sequence

Generate a sequence to see terms