Using this online IDE, create a Python script with a recursive function to display the sum of the first n integers, where n is entered by the user.

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A: Actually, python is a easiest programming language. It is a dynamically typed programming language.

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Q: int i,j; for(i=0; i< 5; i++) for(j=0;j<=i;j++)

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A: The above code is verified using Python 3.

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A: To check if the email address and phone number entered by the user is in correct format.