"Informatics Stars" Online Contests - 2011-2014 |
Start: Oct.20.2012 at 10:00:00 AM
Finish: Oct.20.2012 at 03:00:00 PM
The contest is finished!
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Time limit 2000/4000/4000/4000 ms. Memory limit 65000/65000/65000/65000 Kb.
Prepared by Ibrahim Mesecan.
Prime Palindromes
Shqip
A prime number is a natural number that has exactly two distinct natural number divisors: 1 and itself.
A palindromic number is a 'symmetrical' number like 16461, that remains the same when its digits are reversed.
A number is prime palindrome if it's at the same time prime and palindromic number. Write a program that finds the number
of prime palindromic numbers between two given numbers: m and n.
For example: If m and n are given : 10000 12000
Then the prime palindromic numbers are: 10301 10501 10601 11311 11411.
Input specification
There will be two numbers in the input file which are between
1 ≤ n < m ≤ 100000.
Output specification
Find the number of prime palindromic numbers between the given numbers.
If there is no prime palindromic number within the given range show 0 (zero).
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Input
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10000 12000
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Output
5
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Для отправки решений необходимо выполнить вход.
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