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Find 5 four digit numbers such that the product of the digits of each four digit prime number are also prime?
You had me until "product." The product of 4 digits can't be prime.
What are all of the one-digit prime numbers?
2, 3, 5, and 7 are the only one-digit prime numbers.
How many positive prime numbers have a ones digit of 5?
Only one positive prime number has a 5 in the ones digit. That prime number is 5. All other numbers with a 5 in the ones digit are composite because they will be divisible by 5.
Two prime numbers between 100 and 199 such that the tens digit is a prime number and the tens and ones digit taken together are a 2 digit prime number find the sum of these two prime numbers?
For the tens digit to be a prime number then it must equal 2, 3, 5 or 7. There are four 3-digit prime numbers that fit the above condition and also have the tens and units digits forming a 2-digit prime number. 131, 137, 173, 179. The person supplying the question may like to sum the various combinations.
What is the greatest six digit number you can write if each digit must be different and no digit may be prime?
Its impossible, there are only 5 single digit numbers that are not prime
What is the lowest 5 digit prime number?
four The lowest 5 digits prime number is 10007
How many 5 digit prime numbers are there?
An on-line prime number chart ended at 10007. There are many more charts available for download. So the answer is that there are many five digit prime numbers.
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 four digit counting numbers are not multiple of 5?
There are 7200 such numbers.
What is the ratio of the number of one-digit prime numbers and the number of one-digit composite numbers?
The ratio of the number of one-digit prime numbers to the number of one-digit composite numbers is one to one. The one-digit prime numbers are 2, 3, 5, and 7. The one-digit composite numbers are 4, 6, 8, and 9. Therefor, the ratio is 4:4, which simplifies to 1:1.
What is the least 4 digit prime numbers?
2, 3, 5, And 7 are the first 4 prime numbers
How many single-digit prime numbers are there?
4: 2, 3, 5 and 7. 1 is not a prime.
