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HMMT 2022 A10

  • Algebra and Number Theory
  • Answer

Compute the smallest positive integer nn for which there are at least two odd primes pp such that

∑k=1n(−1)νp(k!)<0\sum_{k=1}^{n}(-1)^{\nu_{p}(k!)}<0

Note: for a prime pp and a positive integer m,νp(m)m, \nu_{p}(m) is the exponent of the largest power of pp that divides mm; for example, ν3(18)=2\nu_{3}(18)=2.

Dataset text NuminaMath olympiads. Quoted with source.

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