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|amount=Unknown |
|amount=Unknown |
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|expression=A prime which can be read the same forwards and backwards |
|expression=A prime which can be read the same forwards and backwards |
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| − | |1st=[[2]], [[3]], [[5]], [[7]], [[11]], [[101]], [[131]], [[151]] |
+ | |1st=[[2]], [[3]], [[5]], [[7]], [[11]], [[101]], [[131]], [[151]]}} |
Palindromic Primes are prime numbers that are palindromes, or in other words, they are the same number when read from left to right or right to left. The first four palindromic primes are trivially palindromic, as they are single digit values. |
Palindromic Primes are prime numbers that are palindromes, or in other words, they are the same number when read from left to right or right to left. The first four palindromic primes are trivially palindromic, as they are single digit values. |
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| − | All palindromic primes have an odd number of digits |
+ | All palindromic primes except for 11 have an odd number of digits, as all palindromes of even length are divisible by 11. |
==Examples== |
==Examples== |
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*[[7]] is a palindromic prime, since it has only one digit. |
*[[7]] is a palindromic prime, since it has only one digit. |
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| − | *[[ |
+ | *[[131]] is a palindromic prime, since the digits stay the same when it is reversed. |
==The First Few Palindromic Primes== |
==The First Few Palindromic Primes== |
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191.png|link=191 |
191.png|link=191 |
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313.png|link=313 |
313.png|link=313 |
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| − | 373.png |
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| − | 383.png |
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| − | 727.png |
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| − | 757.png |
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| − | 787.png |
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| − | 797.png |
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| − | 919.png |
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</gallery> |
</gallery> |
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[[Category:Types of Primes]] |
[[Category:Types of Primes]] |
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Revision as of 11:27, 27 January 2018
| Palindromic Primes
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|---|---|
Basic Info
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| Discovered by | N/A |
| Number of | Unknown |
| Description | A prime which can be read the same forwards and backwards |
| First Few | 2, 3, 5, 7, 11, 101, 131, 151 |
Palindromic Primes are prime numbers that are palindromes, or in other words, they are the same number when read from left to right or right to left. The first four palindromic primes are trivially palindromic, as they are single digit values.
All palindromic primes except for 11 have an odd number of digits, as all palindromes of even length are divisible by 11.
Examples
- 7 is a palindromic prime, since it has only one digit.
- 131 is a palindromic prime, since the digits stay the same when it is reversed.
The First Few Palindromic Primes
