问题
So I was able to solve this problem with a little bit of help from the internet and this is what I got:
def isPrime(n):
for i in range(2,int(n**0.5)+1):
if n%i==0:
return False
return True
But my question really is how to do it, but WHY. I understand that 1 is not considered a \"prime\" number even though it is, and I understand that if it divides by ANYTHING within the range it is automatically prime thus the return False statement. but my question is what role does the squaring the \"n\" play here? Thank you very much for your attention
P.s. I am very inexperienced and have just been introduced to programming a month ago :S
回答1:
Of many primality tests floating around the Internet, consider the following prime test:
def is_prime(n):
if n == 2 or n == 3: return True
if n < 2 or n%2 == 0: return False
if n < 9: return True
if n%3 == 0: return False
r = int(n**0.5)
f = 5
while f <= r:
print '\t',f
if n%f == 0: return False
if n%(f+2) == 0: return False
f +=6
return True
Consider the prime number 5003:
print is_prime(5003)
Prints:
5
11
17
23
29
35
41
47
53
59
65
True
The line r = int(n**0.5) evaluates to 70 (the square root of 5003 is 70.7318881411 and int() truncates this value)
Because of the first few tests, and the tests in the middle of loop, the loop only needs to be evaluated every 6th number.
Consider the next odd number (since all even numbers other than 2 are not prime) of 5005, same thing prints:
5
False
The limit is the square root since x*y == y*x The function only has to go 1 loop to find that 5005 is divisible by 5 and therefore not prime. Since 5 X 1001 == 1001 X 5 (and both are 5005), we do not need to go all the way to 1001 in the loop to know what we know at 5!
Now, let's look at the algorithm you have:
def isPrime(n):
for i in range(2,int(n**0.5)+1):
if n%i==0:
return False
return True
There are two issues:
- It does not test if
nis less than 2, and there are no primes less than 2; - It tests every number between 2 and n**0.5 including all even and all odd numbers. Since every number greater than 2 that is divisible by 2 is not prime, we can speed it up a little by only testing odd numbers greater than 2.
So:
def isPrime2(n):
if n==2 or n==3: return True
if n%2==0 or n<2: return False
for i in range(3,int(n**0.5)+1,2): # only odd numbers
if n%i==0:
return False
return True
OK -- that speeds it up by about 30% (I benchmarked it...)
The algorithm I used is_prime is about 2x times faster still, since only every 6th integer is looping through the loop. (Once again, I benchmarked it.)
Side note: x**0.5 is the square root:
>>> import math
>>> math.sqrt(100)==100**0.5
True
Side note 2: primality testing is an interesting problem in computer science.
回答2:
With n**.5, you are not squaring n, but taking the square root.
Consider the number 20; the integer factors are 1, 2, 4, 5, 10, and 20. When you divide 20 by 2 and get 10, you know that it is also divisible by 10, without having to check. When you divide it by 4 and get 5, you know it is divisible by both 4 and 5, without having to check for 5.
After reaching this halfway point in the factors, you will have no more numbers to check which you haven't already recognized as factors earlier. Therefore, you only need to go halfway to see if something is prime, and this halfway point can be found by taking the number's square root.
Also, the reason 1 isn't a prime number is because prime numbers are defined as having 2 factors, 1 and itself. i.e 2 is 1*2, 3 is 1*3, 5 is 1*5. But 1 (1*1) only has 1 factor, itself. Therefore, it doesn't meet this definition.
回答3:
The question was asked a bit ago, but I have a shorter solution for you
isPrime(Number):
return 2 in [Number,2**Number%Number]
The math operation will always return 2 if the number is a prime, instead of 2. But if 2 is the given number, it is appended to the list where we are looking into.
2^5=32 32%5=2
2^7=128 128%7=2
2^11=2048 2048%11=2
and so on ...
isPrime() returns True if Number is Prime, and False if not.
回答4:
No floating point operations are done below. This is faster and will tolerate higher arguments. The reason you must go only to the square-root is that if a number has a factor larger than its square root, it also has a factor smaller than it.
def is_prime(n):
""""pre-condition: n is a nonnegative integer
post-condition: return True if n is prime and False otherwise."""
if n < 2:
return False;
if n % 2 == 0:
return n == 2 # return False
k = 3
while k*k <= n:
if n % k == 0:
return False
k += 2
return True
回答5:
Finding the square root of the number is for efficiency. eg. if I am trying to find the factors of 36, the highest number that can be multiplied by itself to form 36 is 6. 7*7 = 49.
therefore every factor of 36 has to be multiplied by 6 or a lesser number.
回答6:
def is_prime(x):
if x < 2:
return False
elif x == 2:
return True
for n in range(2, x):
if x % n ==0:
return False
return True
回答7:
This method will be slower than the the recursive and enumerative methods here, but uses Wilson's theorem, and is just a single line:
from math import factorial
def is_prime(x):
return factorial(x - 1) % x == x - 1
回答8:
isPrime=lambda x: all(x % i != 0 for i in range(int(x**0.5)+1)[2:])
and here goes how to use it
isPrime(2) == False
isPrime(5) == True
isPrime(7) == True
To find all primes you might use:
filter(isPrime, range(4000)[2:])[:5]
=> [2, 3, 5, 7, 11]
Note that 5, in this case, denotes number of prime numbers to be found and 4000 max range of where primes will be looked for.
回答9:
Every code you write should be efficient.For a beginner like you the easiest way is to check the divisibility of the number 'n' from 2 to (n-1). This takes a lot of time when you consider very big numbers. The square root method helps us make the code faster by less number of comparisons. Read about complexities in Design and Analysis of Algorithms.
回答10:
I don't know if I am late but I will leave this here to help someone in future.
We use the square root of (n) i.e int(n**0.5) to reduce the range of numbers your program will be forced to calculate.
For example, we can do a trial division to test the primality of 100. Let's look at all the divisors of 100:
2, 4, 5, 10, 20, 25, 50 Here we see that the largest factor is 100/2 = 50. This is true for all n: all divisors are less than or equal to n/2. If we take a closer look at the divisors, we will see that some of them are redundant. If we write the list differently:
100 = 2 × 50 = 4 × 25 = 5 × 20 = 10 × 10 = 20 × 5 = 25 × 4 = 50 × 2 the redundancy becomes obvious. Once we reach 10, which is √100, the divisors just flip around and repeat. Therefore, we can further eliminate testing divisors greater than √n.
Take another number like 16.
Its divisors are, 2,4,8
16 = 2 * 8, 4 * 4, 8 * 2.
You can note that after reaching 4, which is the square root of 16, we repeated 8 * 2 which we had already done as 2*8. This pattern is true for all numbers.
To avoid repeating ourselves, we thus test for primality up to the square root of a number n.
So we convert the square root to int because we do not want a range with floating numbers.
Read the primality test on wikipedia for more info.
回答11:
This is my method:
import math
def isPrime(n):
'Returns True if n is prime, False if n is not prime. Will not work if n is 0 or 1'
# Make sure n is a positive integer
n = abs(int(n))
# Case 1: the number is 2 (prime)
if n == 2: return True
# Case 2: the number is even (not prime)
if n % 2 == 0: return False
# Case 3: the number is odd (could be prime or not)
# Check odd numbers less than the square root for possible factors
r = math.sqrt(n)
x = 3
while x <= r:
if n % x == 0: return False # A factor was found, so number is not prime
x += 2 # Increment to the next odd number
# No factors found, so number is prime
return True
To answer the original question, n**0.5 is the same as the square of root of n. You can stop checking for factors after this number because a composite number will always have a factor less than or equal to its square root. This is faster than say just checking all of the factors between 2 and n for every n, because we check fewer numbers, which saves more time as n grows.
回答12:
def isPrime(num,div=2):
if(num==div):
return True
elif(num % div == 0):
return False
else:
return isPrime(num,div+1)
==============================================
EDITED
def is_prime(num, div = 2):
if num == div: return True
elif num % div == 0: return False
elif num == 1: return False
else: return is_prime(num, div + 1)
回答13:
def is_prime(x):
if x < 2:
return False
for n in range(2, (x) - 1):
if x % n == 0:
return False
return True
回答14:
Implemented a pseudocode (https://en.wikipedia.org/wiki/Primality_test) in python, hope this help.
# original pseudocode https://en.wikipedia.org/wiki/Primality_test
def isPrime(n):
# Corner Cases
if (n<= 1): return False
elif (n<= 3): return True
elif (n%2 == 0 or n%3 == 0): return False
i = 5
while i*i<=n:
if (n%i==0 or n%(i+2)==0): return False
i += 6
return True;
%timeit isPrime(800)
回答15:
int(n**0.5) is the floor value of sqrt(n) which you confused with power 2 of n (n**2). If n is not prime, there must be two numbers 1 < i <= j < n such that: i * j = n.
Now, since sqrt(n) * sqrt(n) = n assuming one of i,j is bigger than (or equals to) sqrt(n) - it means that the other one has to be smaller than (or equals to) sqrt(n).
Since that is the case, it's good enough to iterate the integer numbers in the range [2, sqrt(n)]. And that's exactly what the code that was posted is doing.
If you want to come out as a real smartass, use the following one-liner function:
import re
def is_prime(n):
return not re.match(r'^1?$|^(11+?)\1+$',n*'1')
An explanation for the "magic regex" can be found here
回答16:
def fun(N):#prime test
if N>1 :
for _ in xrange(5):
Num=randint(1,N-1)
if pow(Num,N-1,N)!=1:
return False
return True
return False
True if the number is prime otherwise false
回答17:
This is my np way:
def is_prime(x):
if x < 4:
return True
if all([(x > 2), (x % 2 == 0)]):
return False
else:
return np.array([*map(lambda y: ((x % y) == 0).sum(), np.arange(1, x + 1))]).sum() == 2
Here's the performance:
%timeit is_prime(2)
%timeit is_prime(int(1e3))
%timeit is_prime(5003)
10000 loops, best of 3: 31.1 µs per loop
10000 loops, best of 3: 33 µs per loop
10 loops, best of 3: 74.2 ms per loop
回答18:
def is_prime(n):
n=abs(n)
if n<2: #Numbers less than 2 are not prime numbers
return "False"
elif n==2: #2 is a prime number
return "True"
else:
for i in range(2,n): # Highlights range numbers that can't be a factor of prime number n.
if n%i==0:
return "False" #if any of these numbers are factors of n, n is not a prime number
return "True" # This is to affirm that n is indeed a prime number after passing all three tests
回答19:
It was an exercise in codecademy and that's how i passed it below...
def is_prime(x):
# If number(x) is evenly divided by following dividers then number(x) is not prime
divider = [2, 3, 5, 7]
# An empty list to be able to check whether number(x) is evenly divided:
remainder = []
# exceptions for numbers 1,2,3,5,7:
if x < 2:
return False
if x in divider:
return True
else:
for nums in divider:
remainder.append(x % nums)
if 0 in remainder:
return False
else:
return True
回答20:
def is_prime(n):
if (n==2 or n==3): return True
if(n<=1 or n%2==0 or n%3==0 ): return False
for i in range(6,int((n**0.5)) + 2,6):
if(n%(i-1)==0 or n%(i+1)==0):
return False
return True
回答21:
Pretty simple!
def prime(x):
if x == 1:
return False
else:
for a in range(2,x):
if x % a == 0:
return False
return True
回答22:
The number 1 is a special case which is considered neither prime nor composite. For more info visit : http://mathworld.wolfram.com/PrimeNumber.html
And, (n**0.5) --> This will give us the "square root" of 'n'. As it is "n raised to the power 0.5 or 1/2"
And WHY do we do that, Take for example the number 400: We can represent it in the form a*b
1*400 = 400
2*200 = 400
4*100 = 400
5*80 = 400
8*50 = 400
10*40 = 400
16*25 = 400
20*20 = 400
25*16 = 400
40*10 = 400
50*8 = 400
80*5 = 400
100*4 = 400
200*2 = 400
400*1 = 400
Square root of 400 is 20: and we can see that we only need to check the divisibility till 20 because, as 'a' reaches 20 'b' starts decreasing... So, ultimately we are checking divisibility with the numbers less than the square root.
回答23:
I have a new solution which I think might be faster than any of the mentioned Function in Python
It's based on the idea that: N/D = R for any arbitrary number N, the least possible number to divide N (if not prime) is D=2 and the corresponding result R is (N/2) (highest).
As D goes bigger the result R gets smaller ex: divide by D = 3 results R = (N/3) so when we are checking if N is divisible by D we are also checking if it's divisible by R
so as D goes bigger and R goes smaller till (D == R == square root(N))
then we only need to check numbers from 2 to sqrt(N) another tip to save time, we only need to check the odd numbers as it the number is divisible by any even number it will also be divisible by 2.
so the sequence will be 3,5,7,9,......,sqrt(N).
import math
def IsPrime (n):
if (n <= 1 or n % 2 == 0):return False
if n == 2:return True
for i in range(3,int(math.sqrt(n))+1,2):
if (n % i) == 0:
return False
return True
回答24:
(https://www.youtube.com/watch?v=Vxw1b8f_yts&t=3384s) Avinash Jain
for i in range(2,5003):
j = 2
c = 0
while j < i:
if i % j == 0:
c = 1
j = j + 1
else:
j = j + 1
if c == 0:
print(str(i) + ' is a prime number')
else:
c = 0
回答25:
Here is mine
import math
def is_prime(num):
if num % 2 == 0 and num > 2:
return False
for i in range(3, int(math.sqrt(num)) + 1, 2):
if num % i == 0:
return False
return True
回答26:
def is_prime(x):
if x<2:
return False
elif x == 2:
return True
else:
for n in range(2, x):
if x%n==0:
return False
return True
回答27:
Srsly guys... Why so many lines of code for a simple method like this? Here's my solution:
def isPrime(a):
div = a - 1
res = True
while(div > 1):
if a % div == 0:
res = False
div = div - 1
return res
来源：https://stackoverflow.com/questions/15285534/isprime-function-for-python-language