What an Odd Fact(or)

Problem | Hint | Solution | Printable page |
Stage: 3 Challenge Level: Challenge Level:3 Challenge Level:3 Challenge Level:3
Can you show that $1^{99} + 2^{99} + 3^{99} + 4^{99} + 5^{99}$ is divisible by $5$?

Published November 2003,December 2003.