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What is the sum of prime numbers between 0 to 20?

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What is the sum of prime numbers between 0 to 20?
posted Feb 8 by Saif Khanam

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1 Answer

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2+3+5+7+11+13+17+19=77

answer Feb 8 by Hanifa Mammadov



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+1 vote

Find the sum of all the prime numbers larger than 2 less than 10^12 that are 1 more than a perfect square. Because the number can get pretty big provide the answer mod 1007.

Note: Problem shouldn't take much more than one minute if your answer is taking too long consider looking for optimizations.

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