Number Gossip
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Unique Properties of 399
- 399 is the smallest Lucas-Carmichael number
- 399 is the smallest product of three distinct primes, such that the sum of the primes, the sum of the squares of the primes, and the sum of the cubes of the primes are all prime numbers
- 399 is the smallest number n such that x and y exist with n = σ(x2) = σ(2y2)