【實用教育app】Sum of Primes|最夯免費app

If you like numbers, you'll like Sum of Primes. It's a cool little app that will display the sum of consecutive primes for integers greater than 1 up to 100,000,000.

For example, the number 41 can be written as 2 + 3 + 5 + 7 + 11 + 13.

However, there are some integers that cannot be expressed this way because their summands do not consist of consecutive primes. For example, 20 is expressed as 7 + 13 (missing 11) or 3 + 5 + 5 + 7 (duplicate 5).

Blog: http://tinyurl.com/sum-primes-blog

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