This is the updated Middle-Square Method, created by Bernard Widynski in 2017. As we did for the original version, we are going to use the middle six digits of the seed.

Adding a Weyl Sequence clearly improved the quality of this type of PRNG, though it still suffers from a very short period and, as the plot results show, the output isn't very random compared to newer generators. It does, however, pass many of our tests.

// The current state value
state = 1138;

// Values used for the Weyl Sequence
s = $b5ad4eceda1ce2a9;
w = 0;

// random number generator
function RandomNumber() {

	// Multiply the state by itself
	tmp = state * state;

	// Add the Weyl Sequence
	w = w + s;
	tmp = tmp + w;

	// Add enough padding to make it at least 8 digits
	tmp.pad_left('0', 8);

	// Save the middle 6 digits
	state = tmp.substr( (tmp.length / 2) - 3 , 6 );

	// Return the new value
	return state;

}