A Fibonacci sequence is a mathematical sequence that starts with zero, and continues by adding the previous two terms.
The Fibonacci sequence starts:
0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55.
Each term from the second term onwards is achieved by adding the pervious two terms.
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The Lion and the Pit (De leone quite erat in puteo) - A pit was 50 handbreadths in depth: A lion climbed up the pit 1/7 handbreadth every day and fell back 1/9 handbreadth. How long would it take him to get out of the pit?
A Fibonacci number is found by starting with 0, then adding 1=1, then add 1= 1+1=2, then add 1+2=3, then add 2+3=4, then add 4+3=7. If we keep it up we end up with 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ... . The Fibonacci numbers are found by starting with 0, adding 1, then adding the result to the integer immediately preceding the equals sign.