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The first six triangular numbers (not starting with T 0, but rather, T 1) Triangular Numbers Plot. A triangular number or triangle number counts objects arranged in an equilateral triangle.
Colombia, [b] officially the Republic of Colombia, [c] is a country primarily located in South America with insular regions in North America.The Colombian mainland is bordered by the Caribbean Sea to the north, Venezuela to the east and northeast, Brazil to the southeast, Peru and Ecuador to the south and southwest, the Pacific Ocean to the west, and Panama to the northwest.