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Summing Consecutive Numbers

15 = 7 + 8 and 10 = 1 + 2 + 3 + 4. Can you say which numbers can be expressed as the sum of two or more consecutive integers?

Forgotten Number

I have forgotten the number of the combination of the lock on my briefcase. I did have a method for remembering it...

Series Sums

Let S1 = 1 , S2 = 2 + 3, S3 = 4 + 5 + 6 ,........ Calculate S17.

Take Ten Sticks

Age 11 to 16
Challenge Level

To get 7 - 1 - 1 - 1 how many heaps could there have been in the line before?