The prime numbers between 500 and 600 are : 503, 509, 521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593 and 599.
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The numbers 503, 509, 521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593 and 599 are prime.
The number halfway between them is 600.
To find the numbers between 400 and 600 that either begin or end with the digit 5, we can break it down into two parts. First, let's find the numbers that begin with 5: There are 10 numbers between 500 and 599 that start with 5. Next, let's find the numbers that end with 5: There are 10 numbers between 405 and 595 that end with 5. Adding these two sets together gives us a total of 20 numbers between 400 and 600 that either begin or end with the digit 5.
600 * * * * * It is, in fact, 639