You need to give n sequential numbers the sum of which will equal to the cube of the given number. For example if n =4, you will have to find 4 odd numbers the sum of which will equal to 4^3. If n=6 you have to find 6 odd numbers the sum of which will equal to 6^3. Also, you have to follow the mathematical formula according to which a1, a2=a1+2, a3 = a2 +2 etc. Hope this helps