Table of Contents
- 1 What are the Emirps between 1 and 100?
- 2 How many Emirps are there?
- 3 How do I find my emirp number?
- 4 How many Emirp numbers are there less than 100?
- 5 What is Emirp number in Python?
- 6 Is Emirp a word?
- 7 Which is an example of an emirp number?
- 8 Are there infinitely many emirps in base 12?
- 9 Is the emirp prime the same as the reversible prime?
What are the Emirps between 1 and 100?
An emirp (prime spelled backwards) is a prime that gives you a different prime when its digits are reversed. For example, 13 and 31 are emirps. List all emirps between 1 and 100. 13 & 31, 17 & 71, 37 & 73, 79 & 97.
How many Emirps are there?
The first few are 13, 17, 31, 37, 71, 73, 79, 97, 107, 113, 149, 157, (OEIS A006567).
How do I find my emirp number?
Steps to find Emirp Number
- Read or initialize a number (n).
- First, check the given number (n) is prime or not. If not, break the execution and exit. If prime, find the reverse (r) of the given number (n).
- Check the reverse number (r) is prime or not. If not, print number (n) is not emirp.
What is the smallest emirp?
A twin emirp (or emirp twin) is a pair of emirp such that the smaller one and its reversal is a twin prime. For example 71 is the smallest twin emirp. 71, 73, 17 and 19 are all different primes, so 71 is a twin emirp.
What is a Emirp number?
An Emirp Number (prime spelled backwards) is a prime number that results in a different prime when its decimal digits are reversed. This definition excludes the related palindromic primes. Examples : Input : n = 13 Output : 13 is Emirp!
How many Emirp numbers are there less than 100?
8 emirps
There are 8 emirps between 1 and 100.
What is Emirp number in Python?
We all know Emirp number is (letters of prime in backward direction) is a prime number that results in a different prime when its digits are reversed. So, if the input is like n = 97, then the output will be True as the reverse of 97 is 79 which is another prime.
Is Emirp a word?
The word ’emirp’ is the word ‘prime’ spelled backwards. So, emirp numbers are prime numbers that are prime again when you write them backwards. Writing a prime number backwards can be done by reversing its digits.
Is 23 a mirror prime number?
Twenty-three is the ninth prime number, the smallest odd prime that is not a twin prime. Twenty-three is also the fifth factorial prime, the second Woodall prime. It is an Eisenstein prime with no imaginary part and real part of the form 3n − 1. 23 is the third base-10 repunit prime exponent after 2 and 19.
Is 22 a Smith number?
There are 376 Smith numbers less than 10,000. The first ten are 4, 22, 27, 58, 85, 94, 121, 166, 202, and 265. The last three are 9,942; 9,975; and 9,985.
Which is an example of an emirp number?
An emirp (prime spelled backward) is a nonpalindromic prime number whose reversal is also a prime. For example, 17 is a prime and 71 is a prime. So, 17 and 71 are emirps. Write a program that displays the first 100 emirps.
Are there infinitely many emirps in base 12?
It is an open problem whether there are infinitely many emirps. (sequence A178545 in the OEIS ) The emirps in base 12 are (using rotated two and three for ten and eleven, respectively):
Is the emirp prime the same as the reversible prime?
An emirp ( prime spelled backwards) is a prime number that results in a different prime when its decimal digits are reversed. This definition excludes the related palindromic primes. The term reversible prime is used to mean the same as emirp, but may also, ambiguously, include the palindromic primes.
Which is the smallest emirp 71 or 73?
A twin emirp (or emirp twin) is a pair of emirp such that the smaller one and its reversal is a twin prime. For example 71 is the smallest twin emirp. 71, 73, 17 and 19 are all different primes, so 71 is a twin emirp.