Prime quadruplet 23620, 152141, 1028789, 7188960, 51672312, 381226246, 2873279651 . The constant representing the sum of the reciprocals of all prime quadruplets, Brun's constant for prime quadruplets, denoted by "B", is the sum of the reciprocals of all prime quadruplets: with value: This constant should not be confused with the Brun's constant for cousin primes, prime pairs of the form ("p", "p" + 4), which is also written as "B". The prime quadruplet {11, 13, 17, 19} is alleged to appear on the Ishango bone although this is disputed. Excluding the first prime quadruplet, the shortest possible distance between two quadruplets {"p",
17-11-70 that album producer Gus Dudgeon remixed the tracks to create a notably different sound from the original US LP mixes. In addition to level changes, Dudgeon's version also added some echo and other effects not present in the earlier mixes, which has drawn mixed reactions from fans. The 2017 Record Store Day special reissue features the six remained-unreleased songs from the concert, plus "Amoreena" (featured on the 1996 CD). The track listing for the first two sides is the same as the original 1970 release. Note Production Album 17-11-70 17-11-70 (US title "11-17-70"), released in 1971, is the fifth official