FTA: Disposed of permanently and safely.

Vitrification is accomplished by mixing waste from Hanford's underground tanks with glass-forming materials in high-temperature melters. As the materials are heated to 2,100 degrees Fahrenheit, the waste is incorporated into the molten glass. This “liquid glass” is poured into stainless steel canisters to cool.

Once cooled, the now-solid vitrified waste within the canisters can be disposed of permanently and safely. The most hazardous waste will be buried in a national repository. Less dangerous wastes will be disposed of at the Integrated Disposal Facility on the Hanford Site.

Prime numbers become less frequent as the numbers get larger, so if you want to implement a function that tests whether a number is prime, just always returning false will get more and more accurate as you count up. The console output is just saying whether it was correct to say the number isn't prime, and the percent is the accuracy over the previous numbers