(1+Fibonacci[2+3*Floor[Floor[ Log(N*Sqrt(5))/Log((1+sqrt(5))/2)]/3]])/2 where N=4000000

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.