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FMO 2026 - Grade 9 - International - Paper 06 Question 15

FMO · FMO 2026 - Grade 9 - International - Paper 06

Question 15

For a positive integer n, f(n) is the exponent of the largest power of 2 dividing n. The source gives the example “f(40)=3 as $20=2^3\times 5$”. Find f(N) for $N=1\times 2\times\cdots\times 2023$.

Editorial note: the displayed factorisation in the example has a typographical error; use the stated definition of f.
  1. 2023
  2. 1011
  3. 2014
  4. 1516
  5. 2013