Search results
May 30, 2020 · Begin by making a list of all numbers from 2 to the maximum desired prime n. Then repeatedly take the smallest uncrossed number and cross out all of its multiples; the numbers that remain uncrossed are prime. For example, consider the numbers less than 30.
Nov 11, 2012 · SymPy is one choice. It is a Python library for symbolic mathematics. It provides several functions for prime. isprime(n) # Test if n is a prime number (True) or not (False). primerange(a, b) # Generate a list of all prime numbers in the range [a, b). randprime(a, b) # Return a random prime number in the range [a, b). primepi(n) # Return the ...
if primewanted <= 0: print "n must be >= 1". else: lastprime = 2 # 2 is the very first prime number. primesfound = 1 # Since 2 is the very first prime, we've found 1 prime. possibleprime = lastprime + 1 # Start search for new primes right after. while primesfound < primewanted: # Start at 2.
Dec 6, 2017 · I want to print prime numbers between 1 to 100, I write my code like the following but when I run it, it starts printing 3,7,11,17....91 Why not the code print 2? Please help me friends #include <
You know prime numbers can not be even, so you you dont have to check even numbers like 4-6-8-26. So in the range function, which is (2,number) add "2" end of it. like (3,number,2) then program will not check even numbers. ALSO a factor can not be bigger than that numbers square root. So you dont have to check all of numbers till your main ...
Jun 25, 2015 · I was trying to generate all prime numbers in range x to y. I tried simple example first: range(10,11) which means to check if 10 is a prime number: Here is my code: prime_list = [x for x in range(10, 11) for y in range(2,x) if x % x == 0 and x % 1 == 0 and x % y != 0]
It does, but question was "print prime numbers between 1 to 50". – Dmitriy. Commented Jan 22, 2016 at 17:27.
Dec 13, 2010 · Use mathematics first find square root of number then start loop till the number ends which you get after square rooting. check for each value whether the given number is divisible by the iterating value .if any value divides the given number then it is not a prime number otherwise prime. Here is the code.
Aug 19, 2011 at 4:29. 8. Primesieve Sieve of Eratosthenes (SoE) is the very fastest algorithm possible and will always be faster than any implementation of the Sieve of Atkin SoA, including Bernstein's as linked in this answer because primesieve reduces the number of operations compared to SoA: For the 32-bit number range (2^32 - 1), primesieve ...
It doesn't generically find prime numbers, only finds those that do not have 2, 3, 5, 7 as divisors. However, it claims 121 is prime, and it's not: 11 * 11 = 121. Any number where all prime divisors (other than 1) are odd numbers larger than 9 are added to primeArray. –
