Back to Free Tools
FREE TOOLS
Fibonacci and Lucas Generator
Generate a complete finite Fibonacci or Lucas prefix with exact term and sum reports.
Fibonacci/Lucas choice, Unsigned final index
fibonacci-lucas.json
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter the admitted input using Sequence, Final zero-based index.
- Use the explicit mode and declared finite options. Only selected operation fields participate.
- Select Generate sequence prefix and download fibonacci-lucas.json.
Examples
Fibonacci indices0–10 end at55 and sum to143.
Limitations
- Final index0–1,000; at most1,001 terms,4,096-digit arithmetic and2 MiB report;30-second processing limit.
- Zero-based F0=0,F1=1 and L0=2,L1=1. No negative indices, arbitrary recurrence or unbounded prefix.
Related tools
No items found.