BTW, on the subject of negative Fibonacci numbers, they do exist. Just reverse the recursion (F_n+F_{n+1} = F_{n+2}) => (F_{n-2} = F_n-F_{n-1}) and it works.

(Though they aren't terribly interesting: F_{-i} = -F_i * (-1)^i, so the negativeth Fibonacci number is either the negation of or equal to the positiveth Fibonacci number)

Of course phenomist would know about this stuff.

lol

BTW, on the subject of negative Fibonacci numbers, they do exist. Just reverse the recursion (F_n+F_{n+1} = F_{n+2}) => (F_{n-2} = F_n-F_{n-1}) and it works.

(Though they aren't terribly interesting: F_{-i} = -F_i * (-1)^i, so the negativeth Fibonacci number is either the negation of or equal to the positiveth Fibonacci number)

Yeah, there's not much interest there, but thanks