Are the first two numbers in the Fibonacci Series 0 and 1 or 1 and 1?

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Different authors use different conventions for indexing the Fibonacci sequence (n.b., "sequence" not "series"). For example, in Cameron's Combinatorics, he defines F₁=1, F₂=2. The most common choice, used for example in Sloane's Online Encyclopedia of Integer Sequences (http://www.research.att.com/~njas/sequences/), is to define the
zeroth Fibonacci number to be 0 and the first to be 1; thus the second is also 1. With this choice, a number of formulas become simpler and we have this particularly nice number-theoretic result: if m divides n, then the mth Fibonacci number divides the nth Fibonacci number.

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