What are all the emirps between 1 and 100?

What are all the emirps between 1 and 100?

The sequence of emirps begins 13, 17, 31, 37, 71, 73, 79, 97, 107, 113, 149, 157, 167, 179, 199, 311, 337, 347, 359, 389, 701, 709, 733, 739, 743, 751, 761, 769, 907, 937, 941, 953, 967, 971, 983, 991, (sequence A006567 in the OEIS).

How many emirps are there?

There are 8 emirps between 1 and 100.

How do I find my Emirp number?

Steps to find Emirp Number

1. Read or initialize a number (n).
2. 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).
3. Check the reverse number (r) is prime or not. If not, print number (n) is not emirp.

Is 41 an Emirp number?

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, and 97. 4. 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.

Is 13 a mirror prime?

So 11 and 13 are mirror primes. They are also a prime pair.

Is 43 a Sophie Germain prime?

are prime. The first few Sophie Germain primes are 2, 3, 5, 11, 23, 29, 41, 53, 83, 89, 113, 131, (OEIS A005384).

What is PAL prime number?

The first few decimal palindromic primes are: 2, 3, 5, 7, 11, 101, 131, 151, 181, 191, 313, 353, 373, 383, 727, 757, 787, 797, 919, 929, …

Does 73 have a mirror prime?

“73 is the 21st prime number,” Sheldon explains. “Its mirror, 37, is the 12th and its mirror, 21, is the product of multiplying 7 and 3 and in binary 73 is a palindrome, 1001001, which backwards is 1001001.”

Does 97 have a mirror prime?

An emirp (“prime” spelled backwards) is a prime whose (base 10) reversal is also prime, but which is not a palindromic prime. The first few are 13, 17, 31, 37, 71, 73, 79, 97, 107, 113, 149, 157, (OEIS A006567).

Is 47 a Sophie Germain prime?

We have mentioned in this article that 5 ( = 2 × 2 + 1) and 23 (= 11 × 2 + 1) are among the smallest Sophie Germain primes. Incidentally, they are also both safe primes (5 × 2 + 1 = 11 and 23 × 2 + 1 = 47, both 11 and 47 are primes, see also Figure 1).

What kind of prime is an 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.

What does it mean to reverse a emirp number?

Emirp numbers. Emirp is the word “prime” spelled backwards, and it refers to a prime number that becomes a new prime number when you reverse its digits. Emirps do not include palindromic primes (like 151 or 787) nor 1-digit primes like 7. 107, 113, 149, and 157 – reverse them and you’ve got a new prime number on your hands.

Which is an emirp in base ten and base thirteen?

For instance, 17 is a base ten emirP, and in (say) base thirteen, 17 is 14 (and not an even number); 41 in base thirteen is 53 and that is a prime also. So, 17 (the number) is an emirP in both base ten and base thirteen.

How many emirp primes are there in Rosetta Code?

Meeting the requirement for an invocation that lists all emirPs between 7,700 and 8,000 involved further bending, with the result that the subroutine has four parameters. Then I thought: why not specify the base for the numerology? So, five. Now arise such questions as well-based emirPs.