is there an easier way to find out how many prime numbers are under 100 without going through each number? Thanks!

is there an easier way to find out how many prime numbers are under 100 without going through each number? Thanks!

Brenda is thinking of a prime number between 40 and 50. Josh is thinking of a prime number between 10 and 20. The difference between the two numbers is 26. What are the two numbers?

Find the smallest possible value of the whole number "y" such that the product of "y" and 6600 is a square number. To make two identical numbers from 6600 x Y, we add prime...

I got this question when I was doing my SOF Olympiad Practice.The Solution say's the answer is (B).But I don't understand how.....

which number is prime?

It is given that p is a prime number and p > 5. a) Show that p= 6n + 1 or p = 6n + 5 for some positive integer n. b) Hence, show that p2 + 2 is divisible by 3. How...

Each of the first ten prime numbers is written on an individual piece of paper and put into a hat. If two are drawn at once, so that means without replacement, what is the probability that the sum...

The sum of 2 postive prime numbers is a prime number and 3 times that sum is an odd number. Which of the following prime numbers must be one of the original prime numbers?? A)2 B)3 C)5 D)7 E)11 I...

hint- begin by taking its square root

-Which of the following is not a prime number? A. 11 B. 19 C. 5 D. 24

It's about Prime numbers

question 2: Try to find a positive integer n such that n^2-n+41 is not a prime.

138,215,030 is a product of 3 prime numbers. Which ones? How am I supposed to calculate this?

For k≥2 let C(k) donate the number of different k-cycles of σ with fundamental period k. Show that if k is a prime number, then C(k)= (2k-2)/k

I have no idea how to start. sorry

nothing lease

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