Mathematics. 55 is the 10th Fibonacci number and a triangular number (the sum of the consecutive numbers 1 to 10). It is the largest Fibonacci number to also be a triangular number. It is a square pyramidal number (the sum of the squares of the integers 1 to 5) as well as a heptagonal number, and a centered nonagonal number.. In base 10, it is a Kaprekar number.The 6.5×55mm Swedish (also known simply as the 6.5×55 mm) is a firstgeneration smokeless powder rimless bottlenecked rifle cartridge.It was introduced in the 1890s, and is still one of the most common cartridges in modern rifles built for the Scandinavian market today. The cartridge was developed in a joint Norwegian and Swedish effort starting in 1891 for use in the new service rifles then ...
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