Ralf Stephan wrote: > Conjecture: > Differences of products F(k)F(l)F(m), regardless of order, > are either Fibonacci numbers, Lucas numbers, or products of both. No, 1375 = 5*5*55 and 1398 = 2*3*233 are consecutive products of 3 Fibonaccis, but their difference, 23, is not a product of Fibonacci and Lucas numbers. Dean Hickerson dean at math.ucdavis.edu