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Lastly - Well

What are the last two digits of 2^(2^2003)?

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Counting Factors

Is there an efficient way to work out how many factors a large number has?

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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?

Power Crazy

Age 11 to 14 Challenge Level:



What can you say about the values of n that make 7 n + 3 n a multiple of 10?

Are there other pairs of integers between 1 and 10 which have similar properties?