They always factor into a Fib no * a Lucas no. R. On Thu, 27 Feb 2003, Floor en Lyanne van Lamoen wrote: > L.S. > > Is there a good reason why the entries of A001611 (Fibonacci(n) + 1) > after the initial 1,2,2,3 are all composite? Or is this perhaps not > true? > > Sincerely, > Floor. >