Here are the Pizza Hut puzzles, apparently from Conway. They went online this morning, so it's probably too late for a prize. --Rich http://blog.pizzahut.com/flavor-news/national-pi-day-math-contest-problems-a... Calling all math experts and Pizza Hut fans alike! National Pi Day is here and this is your chance to win free pie, thats 3.14 years of Pizza Hut pizza (awarded in Pizza Hut® gift cards)! Take a look at the math problems below and provide your answer to Option A, B, or C in the comments section. Please be sure to note which you are trying to solve. Answers will be time stamped to determine the potential winner and participants can only win once. Best of luck! Pizza Hut & John H. Conway OPTION A: Im thinking of a ten-digit integer whose digits are all distinct. It happens that the number formed by the first n of them is divisible by n for each n from 1 to 10. What is my number? OPTION B: Our schools puzzle-club meets in one of the schoolrooms every Friday after school. Last Friday, one of the members said, Ive hidden a list of numbers in this envelope that add up to the number of this room. A girl said, Thats obviously not enough information to determine the number of the room. If you told us the number of numbers in the envelope and their product, would that be enough to work them all out? He (after scribbling for some time): No. She (after scribbling for some more time): well, at least Ive worked out their product. What is the number of the school room we meet in? OPTION C: My key-rings are metal circles of diameter about two inches. They are all linked together in a strange jumble, so that try as I might, I cant tell any pair from any other pair. However, I can tell some triple from other triples, even though Ive never been able to distinguish left from right. What are the possible numbers of key-rings in this jumble?