# From 30 to 60 Is Not Twice as Hard

by

Michael Dalezman (Yeshiva University)

Mathematics Magazine
April, 2000

Subject classification(s): Algebra and Number Theory | Number Theory | Primes

The author proves and generalizes the fact that 60 is the largest positive integer $$n$$ such that all smaller numbers relatively prime to $$n$$ are primes or powers of one prime.

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