4 years ago

What is the next number 2 3 5 7 11 13 17?

2 answers:

4 0

Answer: The next number is 19

Step-by-step explanation: The numbers are prime numbers, which means they are numbers bigger than 1 and can only be divided by one and itself. For example, the number 2 can only be divided by 1 and 2. This is the only prime number which is also even. To identify prime numbers, it is important to remember some rules of divisibility:

By 2: all the even numbers are divisible by 2;
By 3: numbers are divisible by 3 when the sum of its digits is a number divisible by 3. Example: 27 = 2+7 = 9, which is divisible by 3, so 27 is also divisible by 3;
By 4: if the last 2 digits of a number are divisible by 4 or the number is divisible by 2 twice;
By 5: numbers which end in 5 or 0;
By 6: if a number is even and divisible by 3;
By 7: if the difference between the double of the last digit and the rest of the number is a number which is multiple of 7;