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How many prime numbers from 11 to 100 are there whose digits when interchanged give a prime number?
There are four pair of mirror primes.
How many primes are less than 100?
There 25 primes less than 100: 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97.
How many primes under 100000000?
There are 5,761,455 primes less than 100,000,000. The largest of which is 99,999,989.
How many pairs of coprime primes are there between 1 and 50?
All pairs of two primes are coprime. There are fifteen primes under 50. So that means there are 105 unique pairs of "coprime primes", or more generally, pairs of primes, under 50.
How many twin primes are there in 135-145?
One pair of twin primes between 135 and 145
How many primes are there?
A boatloadThere are in infinite number or primes, and they are still being discovered. The people who discover the prime that has more than 10 million digits will win $100,000. I'm pretty sure they're getting close, something like 9.8 million digits.
How many up numbers of any size have primes only as digits?
An n-digit number has 4^n such numbers.
How many prime numbers from 11 to 100 are there whose digits when interchanged give a prime number?
There are four pair of mirror primes.
How many of the digits in the prime numbers end in 13579?
As there are infinitely many primes (as Euclid proved circa 300 BC) and not all of them are (or can be) known, it is impossible to answer this question.
What Fibonacci number which is also prime?
The first few Fibonacci primes are 2, 3, 5, 13, 89. Fibonacci primes with thousands of digits have been found but it is not known whether there are infinitely many (Wikipedia, see link).
How many Digits on a pigeon?
Pigeons do not have digits like fingers or toes. Instead, they have claws on their feet, typically four on each foot.
How many digits are in 93 million?
Expressed in figures, this is equal to 93,000,000. This is eight digits, including six zeroes.
How many Primes in Transformers are there?
there are 13 primes not 5.
How many three digit numbers have the sum of their digits equal to 22?
21.
How many three digit numbers is average of three digits equal to 2?
21
How many positive integers ar equal to 12 times the sum of their digits?
There are none.
How many 5-digit numbers have digits whose product is equal to 4?
There are 15 of them.
