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Also known as eighty one, eighty-one
numero naturale
AI overview
81 is a natural number that comes after 80 and before 82. It is notable because it equals 3 to the fourth power (3⁴) and is also a perfect square (9 × 9).
AI-generated from the Wikipedia summary — may contain errors.
Article · Italiano
Ottantuno (cf. latino octoginta unus, greco εἷς καὶ ὀγδοήκοντα) è il numero naturale dopo l'80 e prima dell'82.
Abstract from DBpedia / Wikipedia · CC BY-SA
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