R250 is a pseudorandom number generator based on generalized feedback shift registers (GFSRs) invented by Kirkpatrick and Stoll in 1981. Specifically, it is the member GFSR(250,103) of the class of GFSRs. It has fairly good statistical properties (although these are improved by combining it with R521 to form R250/521) and a period of 2250. See Michael Brundage's discussion of R250 and the original paper on GFSRs (ACM login required).hijackerhijacker
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