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

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- January 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?

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

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