This project describes another, more effective PRNG I came up with after seeing the Blum-Blum-Shubb PRNG, defined as follows: a[0]=seed, a[n]=(a[n-1]^2) mod m. I added a small modification, where a[n] gets a different number added on to it every time the value appears again, to try breaking any immediate periodicity. (It ends up making a very large period for large enough m.) Here the B. B. S. variant PRNG, in blue, is compared to Scratch's default PRNG, in red.
