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Raku has a built-in method .is-prime to test for prime numbers. It's great for testing individual numbers or to find/filter a few thousand numbers, but when you are looking for millions, it becomes a drag. No fear, the Raku ecosystem has a fast prime sieve module available which can produce 10 million primes in a few seconds. Once we have the primes, it is just a small matter of filtering and formatting them appropriately.