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How many two digit prime numbers are there?
There are 21 two-digit prime numbers.
How many two digit whole numbers are increased by 18 when their digits are reversed?
7 two-digit numbers.
What is the largest two-digit number that is prime and has prime numbers for both of its digits?
73 is the largest two-digit number that is prime and has prime numbers for both of its digits.
What is the product of the largest single-digit prime number and the largest two-digit prime numbers?
679 is the product of the largest single-digit prime number and the largest two-digit prime number.
What one-digit number is the product of two consecutive prime numbers?
There are only two prime numbers that are consecutive numbers, 2 and 3. Their product is 2 x 3 = 6. The first prime numbers are 2, 3, 5, and 7 and the only two consecutive prime numbers whose product is a single digit are 2 and 3. (The next two consecutive prime numbers, 3 and 5, have a two-digit product.)
How many two digit prime numbers are there?
There are 21 two-digit prime numbers.
How many two digit whole numbers are increased by 18 when their digits are reversed?
7 two-digit numbers.
What is the largest two-digit number that is prime and has prime numbers for both of its digits?
73 is the largest two-digit number that is prime and has prime numbers for both of its digits.
What is the product of the largest single-digit prime number and the largest two-digit prime numbers?
679 is the product of the largest single-digit prime number and the largest two-digit prime number.
What is the difference between the two largest two-digit prime numbers?
There can only be one largest two-digit prime number.
How many two digit prime numbers have a units digit of 7 and what are the prime numbers?
17, 37, 47, 67, 97
What one-digit number is the product of two consecutive prime numbers?
There are only two prime numbers that are consecutive numbers, 2 and 3. Their product is 2 x 3 = 6. The first prime numbers are 2, 3, 5, and 7 and the only two consecutive prime numbers whose product is a single digit are 2 and 3. (The next two consecutive prime numbers, 3 and 5, have a two-digit product.)
What are the first five 2-digit prime numbers?
The first five two-digit prime numbers are 11, 13, 17, 19, and 23.
What are the 10 two digit prime numbers that are the sum of two prime numbers?
For a 2-digit prime number (which are all odd) to be the sum of two prime numbers, one of the prime numbers will have to be 2. That means the difference between the sum and the other addend will have to be 2. Prime numbers that differ by 2 are called twin primes. There are six pairs of 2-digit twin primes. Your numbers are 13, 19, 31, 43, 61 and 73.
What are the two smallest 2 digit prime numbers that have the digit 2?
23 and 29
How many four digit palindromic numbers are there?
The same as the number of two-digit numbers, since the last two digits must the same as the first two, only reversed. So I'll say there are 100 four-digit palindromes.
How many four-digit palindromic numbers are there?
The same as the number of two-digit numbers, since the last two digits must the same as the first two, only reversed. So I'll say there are 100 four-digit palindromes.
