![]() Timings were measured using the command: python -mtimeit -s"import primes" "primes. These are the first 25 prime numbers, as well. Zero and 1 are not considered prime numbers. Any number greater than 5 that ends in a 5 can be divided by 5. ![]() No prime number greater than 5 ends in a 5. If the sum of a number's digits is a multiple of 3, that number can be divided by 3. All other even numbers can be divided by 2. These numbers are hence referred to be prime numbers. Some facts: The only even prime number is 2. Only 1 and the number itself divide each of these numbers. Of the plain Python methods tested, without psyco, for n=1000000, Of the plain Python methods tested, with psyco, for n=1000000, Many thanks to stephan for bringing sieve_wheel_30 to my attention.Ĭredit goes to Robert William Hanks for primesfrom2to, primesfrom3to, rwh_primes, rwh_primes1, and rwh_primes2. Before we begin to list the factors of each number, lets use simple divisibility rules to. Warning: timeit results may vary due to differences in hardware orīelow is a script which compares a number of implementations: They are: 101, 103, 107, 109, 113, 127, 131, 137, 139, and 149.
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