Once we have several good examples, start to categorize them. E.g. Showing that a number is composite, Solving diophantine equations, Telescoping series, finding large prime divisors, etc

See if each category makes sense / is useful. If it is, see if a beginner can easily understand how to approach it, otherwise add a more basic example.

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TopNewestsophie germain identity

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Nice wiki about the identify! Would you like help developing it out further?

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How developing it further,sir?

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List out various problems that use the identity - Example 1, Example 2, Example 3, etc

Once we have several good examples, start to categorize them. E.g. Showing that a number is composite, Solving diophantine equations, Telescoping series, finding large prime divisors, etc

See if each category makes sense / is useful. If it is, see if a beginner can easily understand how to approach it, otherwise add a more basic example.

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Divisible by 5.Check unit digit =1+4=5

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Use Sophie Germain identity.

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