185 (number)

185 (disambiguation) 185 1, 5, 37, 185 185 (one hundred [and] eighty-five) is the natural number following 184 and preceding 186. In mathematics There are 185 different directed graphs on four unlabeled vertices that have at least one sink vertex, with no outgoing edges,A051421 Number of digraphs on n unlabeled nodes with a sink (or, with a source) 185 ways of permuting the squares of a grid of squares in such a way that each square is one unit away from its original position horizontally, vertically, or diagonally,A189181 Number of nX4 array permutations with each element making a single king move and 185 matroids on five labeled elements in which each element participates in at least one basis.A058712 Number of loopless matroids on n labeled points thumb|The Spiral of Theodorus The Spiral of Theodorus is formed by unit-length line segments that, together with the center point of the spiral, form right triangles. 185 of these right triangles fit within the first four turns of this spiral.A137515 Maximal number of right triangles in n turns of Pythagoras's snail 185 is the smallest base b without algebraic factorisation of generalized repunits for which no generalized repunit primes are known.https://www.fermatquotient.com/PrimSerien/GenRepu.txt Allgemeine Repunit-Primzahlen de Fermat Quotient It is known that the generalized repunit number is composite for all prime p < 350,000. See also 185 References 1 Category:Integers