What's with 181783497276652981 and 8682522807148012 in Random (Java 7)?

Question

Why were 181783497276652981 and 8682522807148012 chosen in Random.java?

Here\'s the relevant source code from Java SE JDK 1.7:

Answer 1

As per the link you provided, they have chosen (after adding the missing 1 :) ) the best yield from 2^64 because long can't have have a number from 2^128