The first few prime numbers are: 3, 7, 11, 13, etc. Timings were measured using the command: python -mtimeit -s"import primes" "primes. For example, the number 5 is a prime number, while the number 6 isn’t (since 2 x 3 is equal to 6). Of all the methods tested, allowing numpy, for n=1000000, Of the plain Python methods tested, without psyco, for n=1000000, Of the plain Python methods tested, with psyco, for n=1000000, If num is a prime number and is greater than 2, then the num cannot become 1. After i fail to divide num, increment the i value by 2 and continue. If i divide num, print i, and divide num by i. num20 is this: 2, 3, 5, 7, 9, 11, 13, 15, 17. Start a loop from I 3 to the square root of n. pr 2 pr+ i for i in xrange (3,num+1) if not x for x in pr if ix0 where num is the number I had taken as input from user. But my output has some unexpected values. Any natural number that is not divisible by any other except 1 and itself is called a Prime. 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. Write a Python Program to Find Prime Number using For Loop, While Loop, and Functions. Warning: timeit results may vary due to differences in hardware orīelow is a script which compares a number of implementations:
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