Mersenne prime Mersenne prime In mathematics, a Mersenne prime is a prime number that is one less than a power of two. That is, it is a prime number of the form for some integer . They are named after Marin Mersenne, a French Minim friar, who studied them in the early 17th century. The exponents which give Mersenne primes are 2, 3, 5, 7, 13, 17, 19, 31, ... and the resulting Mersenne primes are 3, 7, 31, 127, 8191, 131071, 524287, 2147483647, ... . If is a composite number then so is . ( is divisible by both and .)
17-11-70 17-11-70 17-11-70 (US title "11-17-70"), released in 1971, is the fifth official album release for Elton John, and his first live album. The recording was taken from a live radio broadcast on 17 November 1970, hence the album's title. According to John, a live album was never planned as a release. Recordings of the broadcast, however, were popular among bootleggers which, according to John's producer, Gus Dudgeon, eventually prompted the record label to release it as an album. It has been said that the release by an eastern bootlegger of the whole 60-minute air cast rather than the 48 minutes