2, 3, 5, and 7 are the only one-digit 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.
73 is the largest 2 digit number that is both prime and has prime numbers for both of its digits.
Greatest 2 digit prime number is 97. Lease 2 digit prime number is 11.
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.)
2, 3, 5, and 7 are the only one-digit 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.
73 is the largest 2 digit number that is both prime and has prime numbers for both of its digits.
Greatest 2 digit prime number is 97. Lease 2 digit prime number is 11.
Greatest 2 digit Prime number is 97. Lease 2 digit prime number is 11.
23 and 29
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.)
13, 23, 43, 53, 73, 83
11 is the smallest 2-digit prime number and 97 is the greatest 2 digit prime number, so their difference is 86
The first five two-digit prime numbers are 11, 13, 17, 19, and 23.
The smallest prime number in which all of the digits are also prime is 2.The smallest multi-digit prime number in which all of the digits are also prime is 23.
The ones digit in the product from multiplying the 305 prime numbers less than 2012 is 0 because the ones digit becomes 0 after 2 and 5 have been multiplied and remains unchanged after more prime numbers are multiplied.