Q: Number of terms between 13 and 251?

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Each number is four more than the previous number.

One way is to test all the prime numbers equal or less than Sqrt[251]. These are: {2,3,5,7,11,13}. We can eliminate 2, 3, and 5 because the number isn't odd, it's digits don't sum to a multiple of 3, and the last digit isn't a 5 or a 0. For 7, note that 252 = 7*36, so 7 cannot divide 251 because that would imply 7 divides 1. For 11, note that 253 = 11*23, so 11 cannot divide 251 because that would imply 11 divides 2. For 13, note that 13*19 = 247, so 13 cannot divide 251 because that would imply 13 divides 4. Hence, 251 is prime

13+47/50

4 and 13/50 =========

There are an infinite number of numbers between 12 and 13. decimals, fractions and irrational numbers

Related questions

Each number is four more than the previous number.

One way is to test all the prime numbers equal or less than Sqrt[251]. These are: {2,3,5,7,11,13}. We can eliminate 2, 3, and 5 because the number isn't odd, it's digits don't sum to a multiple of 3, and the last digit isn't a 5 or a 0. For 7, note that 252 = 7*36, so 7 cannot divide 251 because that would imply 7 divides 1. For 11, note that 253 = 11*23, so 11 cannot divide 251 because that would imply 11 divides 2. For 13, note that 13*19 = 247, so 13 cannot divide 251 because that would imply 13 divides 4. Hence, 251 is prime

13 is not a polynomial.

The number between -14 and 13 is -1/2 or -0.5

The prime number between 8 and 13 is 11.

The whole number between 13 and 17 is 15

It is: 1 and 13/200 in its lowest terms

7 13/100

13+47/50

4 and 13/50 =========

There are an infinite number of numbers between 12 and 13. decimals, fractions and irrational numbers

The difference between 13 and 16 is 3. To find the difference between two numbers subtract the larger number by the smaller number. (16-13=3)