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  2. 25 (number) - Wikipedia

    en.wikipedia.org/wiki/25_(number)

    25 is the sum of the five consecutive single-digit odd natural numbers 1, 3, 5, 7, and 9. 25 is a centered octagonal number, [1] a centered square number, [2] a centered octahedral number, [3] and an automorphic number. [4] 25 percent (%) is equal to ⁠ 1 / 4 ⁠. It is the smallest decimal Friedman number as it can be expressed by its own ...