Relation To LCG
While the Lehmer RNG can be viewed as a particular case of the linear congruential generator with c=0, it is a special case that implies certain restrictions and properties. In particular, for the Lehmer RNG, the initial seed X0 must be coprime to the modulus n that is not required for LCGs in general. The choice of the modulus n and the multiplier g is also more restrictive for the Lehmer RNG. In contrast to LCG, the maximum period of the Lehmer RNG equals n−1 and it is such when n is prime and g is a primitive root modulo n.
On the other hand, the discrete logarithms (to base g or any primitive root modulo n) of Xk in represent linear congruential sequence modulo Euler totient .
Read more about this topic: Lehmer Random Number Generator
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