### random number ⇝

## pseudorandom number

<*programming*> One of a sequence of numbers generated by some
algorithm so as to have an even distribution over some range
of values and minimal correlation between successive
values.

Pseudorandom numbers are used in simulation and encryption. They are pseudorandom not random because the sequence eventually repeats exactly and is entirely determined by the initial conditions.

One of the simplest algorithms is

x[i+1] = (a * x[i] + c) mod mbut this repeats after at most m numbers and successive numbers are closely related. Better algorithms generally use more previous numbers to calculate the next number.

Last updated: 2007-06-29

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**Nearby terms:**

**pseudorandom number**» PseudoScheme » pseudosuit » pseudo-tty