On April Fools’ Day, I wrote about 91, a non-prime that looks prime and has fooled me more than once.
You can generate your own fake primes, or Lamb pseudoprimes, by finding any two or more prime numbers other than 2, 3, 5, and 11 and multiplying them together. It’s all fun and games with little numbers such as 91 and 119 (7×17), but they’re actually pretty serious business in the form of RSA encryption.
Read the full post at Roots of Unity.
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