Be careful, I've implemented the sieve, but not all versions of it are sufficiently fast to handle the biggest numbers in the test suite.
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This doesn't use primes(x),but still feels a little like cheating.
The whole point of using the sieve is not knowing which numbers are prime. So it is no different than sum(primes).
Test if a Number is a Palindrome without using any String Operations
181 Solvers
Numbers with prime factors 2, 3 and 5.
173 Solvers
173 Solvers
Calculate the area of a triangle between three points
926 Solvers
946 Solvers
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