# Fibonacci Numbers/Examples/F173

## Example of Fibonacci Number

The Fibonacci number $F_{173}$ is:

$638 \, 817 \, 435 \, 613 \, 190 \, 763 \, 972 \, 389 \, 505 \, 493$

It can be factorized as:

$6 \, 260 \, 874 \, 567 \, 713 \times 102 \, 033 \, 258 \, 884 \, 875 \, 061$

## Historical Note

David Wells reports in his Curious and Interesting Numbers of $1986$ that Michael A. Morrison and John Brillhart found the prime factors of $F_{173}$ in just over $800$ seconds, but fails to provide a source to corroborate this.

Research is ongoing for further details.