Fibonacci numbers

DEFINITION

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. The fractional version is 1/1, 1/2, 2/3, 3/5, 5/8, 8/13 . . . . Named after Leonardo Fibonacci (1175