What is the remainder when (1^3)+(2^3)+(3^3)+...+(1990^3) is divided by 7?

Printable View

- Jan 13th 2011, 07:19 PMchris86remainder when divided by 7
What is the remainder when (1^3)+(2^3)+(3^3)+...+(1990^3) is divided by 7?

- Jan 13th 2011, 07:46 PMAlso sprach Zarathustra
Try to prove:

If x is integer, then x^3(mod7)=0 or 1 or 6 - Jan 13th 2011, 08:37 PMDrexel28
- Jan 14th 2011, 05:43 AMtonio