178 (one hundred [and] seventy-eight) is the natural number following 177 and preceding 179.
There are 178 biconnected graphs with six vertices, among which one is designated as the root and the rest are unlabeled.[1] There are also 178 median graphs on nine vertices.[2]
178 is one of the indexes of the smallest triple of dodecahedral numbers where one is the sum of the other two: the sum of the 46th and the 178th dodecahedral numbers is the 179th.[3]
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