185 (number)

There are 185 different directed graphs on four unlabeled vertices that have at least one sink vertex, with no outgoing edges,{{cite OEIS|A051421|Number of digraphs on n unlabeled nodes with a sink (or, with a source)}} 185 ways of permuting the squares of a $2\backslash times\; 4$ grid of squares in such a way that each square is one unit away from its original position horizontally, vertically, or diagonally,{{cite OEIS|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.{{cite OEIS|A058712|Number of loopless matroids on n labeled points}}

File:Spiral of Theodorus.svg]]

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.{{cite OEIS|A137515|Maximal number of right triangles in n turns of Pythagoras's snail}}

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