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Q: How many 2 digit prime numbers are there whose unit digit is greater its tens digit?
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What is largest two digit prime numbers whose digits are also prime?

73 satisfies your condition.


Name the prime number between 20 and 30 whose ones digit is 7 greater than its tens digit?

29


What is the smallest two digit prime number whose digits themselves are prime?

The smallest two-digit prime number whose digits themselves are prime is 23. Both 2 and 3 are prime numbers, and together they form the prime number 23.


What two prime numbers multiplied equals a 500 digit number?

The answer is vague but correct . Take any two prime numbers whose combined digit length is 501 and their product will generate a 500 or a 501 digit number.


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Two-digit prime numbers whose digits add up to 10 are:193773


What one-digit number is the product of two consecutive prime numbers?

There are only two prime numbers that are consecutive numbers, 2 and 3. Their product is 2 x 3 = 6. The first prime numbers are 2, 3, 5, and 7 and the only two consecutive prime numbers whose product is a single digit are 2 and 3. (The next two consecutive prime numbers, 3 and 5, have a two-digit product.)


What is the three digit numbers whose tens digit is an odd number that is greater than 10 and less than 20?

Meaningless question.


What is the largest 3 digit prime number whose square root is a prime number?

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What is the largest and smallest of two-digit prime numbers whose digits are also prime digits themseleves?

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How many 2-digit numbers are there whose ones digit is 5 greater than its ten digits?

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