Gorilla Test

For n-bit integers produced by the generator, specify one of the n possible bit positions, with bit numbered n-1 to 0 from most- to least- significant. Form a sequence of 226 + 25 such bits, made up of the designated bit of each of 226 + 25 integers from the generator. If x is the number of 26-bit words that do not appear in that sequence, then x should be approximately normally distributed with mean 24687971 and the standard deviation 4170, so that f((x - 24687971)/4170) should be normally distributed in [0, 1], that is, provide a p-value for the test, where () is the standard normal distribution function.