Emirp numbers
Submissions: 365   Accuracy:


  Difficulty: Easy   Marks: 2

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. Given a number n, the task is to print all such prime numbers from 13 to n  whose reversed number formed is also a prime number and smaller than or equal to n.

The first line of input contains an integer T denoting the number of test cases. Then T test cases follow. The first line of each test case contains the integer N.

Print all Emirp numbers smaller than or equal to n in sorted order with space between two numbers. Print the answer for each test case in a new line. 

1 <= T <= 100
13 <= N <= 105


13 31
13 17 31 37 71 73 79 97

** For More Input/Output Examples Use 'Expected Output' option **

Contributor: Sujnesh Mishra
Author: sujnesh

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