n =int(input())
 a=list()
 b=list()

 for i in range(1,n+1):
      for j in range(1,i+1):
          if i%j==0 :
              b= b.append(j)
      a=a.append(b)
 print(a)

10
 Traceback (most recent call last):
 File "E:/Projects/Chatbot/assign1.py", line 23, in <module>
 a=a.append(b)
 AttributeError: 'NoneType' object has no attribute 'append'