Numbers up

Hmmm ... wouldn't have thought there would have been much competition for this - but a report on Yahoo this morning tells of a group of mathematicians at UCLA who have become eligible for a $100,000 prize by their discovery of a 13-million-digit prime number. Does make you wonder what other research is being undertaken in the quest for financial prizes - and who puts up the purses. Come to think of it, isn't there one being funded by Google - something to do with the moon?