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Omni-MATH / For a given positive integer k denote the square of the sum of its digits by f₁(k) and let f_nplus1(k) equal f_1(f_n(k)). Determine the value of f₁₉₉₁(2¹⁹⁹⁰). · Discussion

Discussing For a given positive integer k denote the square of the sum of its digits by f₁(k) and let f_{nplus{}1}(k) equal{} f_1(f_n(k)). Determine the value of f₁₉₉₁(2¹⁹⁹⁰). · Omni-MATH

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