Primality testing is probabilistic. Calculates the multiplicative inverse. This is mostly useful in modular arithmetic. The fractional value is shown in the status display. The fractional value is shown in the status display.
All buttons have a keyboard equivalent .
Checking for primality on large numbers can take a while if the number is, in fact, prime. You can usually stop the checking by clicking Clear. Scrolling your browser's display window while the caclulator is running can mess up the display. Scrolling off the calculator and then restoring it will usually fix this. While the calculator can handle very large numbers, it isn't hard to come up with a calculation that will exceed your computer's memory capacity, or the capacity of any computer that can fit in the known physical universe.