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Sustainability is a social goal for people to co-exist on Earth over a long period of time. Definitions of this term are disputed and have varied with literature, context, and time. [2] [1] Sustainability usually has three dimensions (or pillars): environmental, economic, and social. [1] Many definitions emphasize the environmental dimension.
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the least irregular prime with index 2. a palindromic number in bases 7 (313 7) and 12 (111 12). a repunit in base 12, so it is a unique prime in the same base. a prime whose digits sum to a prime. (see OEIS: A046704). a prime index prime. In base 10, 157 2 is 24649, and 158 2 is 24964, which uses the same digits.