Prime Minister of the United Kingdom retirement from the Commons, which elevates the individual to the House of Lords. Formerly, the peerage bestowed was usually an earldom, with Churchill offered a dukedom. From the 1960s onward, life peerages were preferred, although in 1984 Harold Macmillan was created Earl of Stockton. Sir Alec Douglas-Home, Harold Wilson, James Callaghan and Margaret Thatcher accepted life peerages, although Douglas-Home had previously disclaimed his hereditary title as Earl of Home. Edward Heath did not accept a peerage of any kind and nor have any of the Prime Ministers to retire since 1990; although Heath and Major were later appointed as Knights
Wilson prime Wilson prime A Wilson prime, named after English mathematician John Wilson, is a prime number "p" such that "p" divides ("p" − 1)! + 1, where "!" denotes the factorial function; compare this with Wilson's theorem, which states that every prime "p" divides ("p" − 1)! + 1. The only known Wilson primes are 5, 13, and 563 ; if any others exist, they must be greater than 2. It has been conjectured that infinitely many Wilson primes exist, and that the number of Wilson primes in an interval ["x", "y"] is about log(log("y")/log("x")). Several computer searches have been done