Is this a floating point problem?

[stacksmith]

A simple loop locks up:

(= i 0)
(while (< i 19000000)
   (= i (+ i 1)))

Is there a preferred way to count?

[ooichu]

Yes, this is a problem related to floating point numbers. After number 16777216 for 4-byte float the accuracy drops, and incrementation has no effect.