As detailed on The Other Wiki here, the number 47 has become an in joke among groups of mathematicians and screenwriters, improbable as the crossover may seem. * One of the biggest users is theStar Trek franchise, to the point of having a page on its wiki. * The protagonist of the Hitman series. * Subverted by HK-47 from Knights of the Old Republic, who is named after the AK-47. Same goes for the multitude of fictional guns with 47 in the name. * As most (all?) the writers of the League of Intergalactic Cosmic Champions were Star Trek fans 47s were a big in joke there too.