\ What is the first term in the Fibonacci sequence to contain 1000 digits?

\ They only want the index.

\ I used the formula of Moivre-Binet (and ignored the (1/phi)^n part):

5e fsqrt 1e f+ 2e f/ fconstant phi
999e 5e fsqrt flog f+ phi flog f/ f>d 1. d+ d.

\ The 1. D+ is there to simulate rounding up (we don't want the last
\ term below, but the first term above).