Ok..had to come back to post this......I found when researching something completely different, but thats what it is like when an idea is lying dormant your head...it swims around and pops up anytime smirk

A Fibonacci sequence.
In their simplest form, a sequence of numbers 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 337, 610, 987, 1597, 2584, 4181, 6765, etc., in which each successive number is equal to the sum of the two preceding numbers.

It works with the fractional version to 1/1, 1/2, 2/3, 3/5, 5/8, 8/13 . . . .

Named after Leonardo Fibonacci (1175 - c.1250)(pr. FEE-bə-NAH-chee), an Italian mathematician, they have unusual characteristics with possible applications in botony, astronomy, and psychology, as well as in the arts. (I just copied that bit, I don't really know.)