[英]how to get list of possible numbers with given number of factors in python?
我可以得到給定數字的因子和因子數:
def all_factors(x):
factors = []
for i in range(1, x + 1):
if x % i == 0:
factors.append(i)
return factors
print(all_factors(320))
print(len(all_factors(320)))
它給出了以下 output:
[1、2、4、5、8、10、16、20、32、40、64、80、160、320]
14
但是,我該如何做相反的事情呢? 例如:如果我的因子數 = 4,則可能的列表必須是 [6, 10, 14, 21, ...] 我們可以限制列表中的最大 integer。
嘗試:
n =int(input("Enter the limit: "))
factno = int(input("No of factors: ")) # here 4
listing = []
for i in range(1,n+1):
#Your code here to find factors and to add then to a list named "factors'
factors = []
for j in range(1, i + 1):
if i % j == 0:
factors.append(j)
if len(factors) == factno:
listing.append(i)
print(listing)
您可以使用:
def all_factors(x, number_factors):
factors = []
for i in range(1, x + 1):
if len(factors) == number_factors:
break
if x % i == 0:
factors.append(i)
return factors
代碼使用你的 all_factors 代碼
def reverse_factors(n, max_):
# Loops through numbers from 1 to max_ to check
# number of factors. Keeps the ones with the desired
# number of factors as determined by len(all_factors(x))
return [x for x in range(1, max_+1) if len(all_factors(x)) == n]
測試
# Numbers with 4 factors up to 30
print(reverse_factors(4, 30))
Output
[6, 8, 10, 14, 15, 21, 22, 26, 27]
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