25 is a centered octagonal number, a centered square number, and an automorphic number. 25 percent (%) is equal to 1 / 4. It is the smallest base 10 Friedman number as it can be expressed by its own digits 5 2. It is also a Cullen number. 25 is the smallest pseudoprime satisfying the congruence 7 n = 7 mod n.The smallest vertebrates (and smallest amphibians) known are Paedophryne amauensis frogs from Papua New Guinea, which range in length from 7.0–8.0 mm (0.28–0.31 in), and average 7.7 mm (0.30 in). [24] [25] Previously, the title of smallest vertebrate was held by members of the fish genus Paedocypris of Indonesia .
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