I have to generate millions of non-repeating random numbers and came across this equation: $x_{i+1} = x_i+c \space(mod \ m)$, where c and m are relative primes and $m \geq total\ to\ be\ generated$.
This works ok since I don't need good random numbers and don't have to memorize them. My question is, what is the demonstration and name of this method? I will have to write about it, but can't find any information not knowing how to formulate my question.