Question

what is twice prime number

Answer 1

A twice prime number is defined as aprime number whose digits are alsoprime. For example: is prime. It is made up of the digit , which is prime, and the digit , which is also prime. Therefore, is twice prime
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Answer 2

Hey mate!

Here is your answer:

A twice prime number refers that  prime number whose digits are also prime. For example: 17 is prime. It is made up of the digit 1, which is prime, and the digit 7, which is also prime. Therefore, 17 is twice prime. Counter example: 13 is prime, but 1 nor 3 is prime and therefore 13 is not twice prime.

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