from math import sqrt def prime_factorization (n): # verify that the input is an integer > 2 if not isinstance (n,int): return([]) if n<2: return([]) factors=[] while n % 2 == 0: factors.append (2) n = n// 2 # remove factors of 2 for i in range(3, int(sqrt (n)) +1,2) : # odd factors while n % i==0: factors.append (i) n = n // i if n > 2: factors.append (n) return factors To see how it works, we try the following factorizations: print (prime_factorization (123456789)) print (prime_factorization (333)) print (prime_factorization (360)) [3, 3, 3607, 3803] [3, 3, 37] [2, 2, 2, 3, 3, 5]

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Explain the prime factorization function in Python, pg 87. How is this an example of induction? How are ordinary mathematical induction, strong mathematical induction, and the well-ordering principle for the integers related?
from math import sqrt
def prime_factorization (n):
# verify that the input is an integer > 2
if not isinstance (n,int): return ([])
if n<2: return([])
factors=[]
while n % 2 == 0:
# remove factor s of 2
factors.append (2)
n = n// 2
for i in range (3, int (sqrt (n) ) +1,2): # odd factors
while n % i==0:
factors.append (i)
n = n // i
if n > 2:
factors.append (n)
return factors
To see how it works, we try the following factorizations:
print
print
print
(prime_factorization (123456789))
(prime_factorization (333))
(prime_factorization (360))
[3, 3, 3607, 3803]
[3, 3, 37]
[2, 2, 2, 3, 3, 5]
87
Ch. 10. Induction
Transcribed Image Text:from math import sqrt def prime_factorization (n): # verify that the input is an integer > 2 if not isinstance (n,int): return ([]) if n<2: return([]) factors=[] while n % 2 == 0: # remove factor s of 2 factors.append (2) n = n// 2 for i in range (3, int (sqrt (n) ) +1,2): # odd factors while n % i==0: factors.append (i) n = n // i if n > 2: factors.append (n) return factors To see how it works, we try the following factorizations: print print print (prime_factorization (123456789)) (prime_factorization (333)) (prime_factorization (360)) [3, 3, 3607, 3803] [3, 3, 37] [2, 2, 2, 3, 3, 5] 87 Ch. 10. Induction
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