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== In mathematics == Fifty-seven is the sixteenth discrete semiprime and the sixth in the (3.q) family. With 58 it forms the fourth discrete bi-prime pair. 57 has an aliquot sum of 23 and is the first composite member of the 23-aliquot tree. Although 57 is not prime, it is jokingly known as the "Grothendieck prime" after a story in which mathematician Alexander Grothendieck supposedly gave it as an example of a particular prime number. This story is repeated in Part 2 of a biographical article on Grothendieck in ''Notices of the American Mathematical Society''. As a semiprime, 57 is a Blum integer since its two prime factors are both Gaussian primes. 57 is a 20-gonal number. It is a Leyland number since 25 + 52 = 57. 57 is a repdigit in base 7 (111). There are 57 vertices and 57 hemi-dodecahedral facets in the 57-cell, a 4-dimensional abstract regular polytope.〔.〕 The Lie algebra E7½ has a 57-dimensional Heisenberg algebra as its nilradical, and the smallest possible homogeneous space for E8 is also 57-dimensional.〔.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「57 (number)」の詳細全文を読む スポンサード リンク
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