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• 05:11, 16 June 2024 Ai talk contribs created page Pentagonal number (Created page with "== Introduction == A pentagonal number is a figurate number that extends the concept of triangular and square numbers to the pentagon. The nth pentagonal number is the number of distinct dots in a pattern of dots consisting of the outlines of regular pentagons with a common vertex, where n is the number of pentagons. The sequence of pentagonal numbers starts with 1, 5, 12, 22, 35, and so on. == Mathematical Definition == The formula for the nth pentagonal number is give...")