Puzzles:
1-10
11-20
21-30
31-40
41-50
51-60
61-70
71-80
81-90
91-100
101-110
111-120
121-130
131-140
141-150
151-160
Index
|
Home
About
Accessibility
Hint to puzzle 43: Sum of two powers
Show that, if n is odd, n
4
+ 4
n
can be written as the difference of two squares.
