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13rd Prime Number

13rd Prime Number = 41

Read more about prime numbers here
. Prime numbers matter a lot in our daily lives and we often don't even realize it. Much of the foundation of cryptography and public keys, so prevalant in our digital systems, are extremely dependent on prime numbers. In the early 2000s a team of IIT Kanpur researchers discovered the AKS Algorithm and published a "Primes is in P" paper - an unconditional deterministic polynomial-time algorithm that determines whether an input number is prime or composite.

The Sieve of Eratosthenes is a very simple and popular technique for finding prime numbers. You might also find it useful to read more about prime factorization here.