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Fibonacci Sequence Calculator

Fibonacci Sequence Calculator

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This calculator generates the Fibonacci sequence, where each number is the sum of the two before it, e.g. the first 10 terms end at 34.

The Fibonacci sequence — where each number is the sum of the two before it — shows up throughout nature, from the spiral patterns of sunflower seeds and pinecones to the branching of trees. Enter how many terms you want and this calculator generates the sequence starting from 0 and 1, using arbitrary-precision arithmetic so even long sequences stay exact with no rounding drift. It's a useful reference for math coursework, programming practice, or exploring one of the most famous patterns in mathematics.

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  • Each Fibonacci number is the sum of the two numbers before it, starting with 0 and 1: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34…
  • The sequence grows very quickly: results are calculated with arbitrary-precision arithmetic so even large term counts stay exact, with no rounding errors.
  • The Fibonacci sequence appears throughout nature, from the spiral patterns of shells and sunflowers to branching in trees.

How is the Fibonacci sequence generated?

Start with 0 and 1. Each following number is the sum of the previous two: 0+1=1, 1+1=2, 1+2=3, 2+3=5, and so on.

What are the first 10 Fibonacci numbers?

0, 1, 1, 2, 3, 5, 8, 13, 21, and 34.