Editing Palindromic number (section)

==Lychrel process==
Non-palindromic numbers can be paired with palindromic ones via a series of operations.  First, the non-palindromic number is reversed and the result is added to the original number. If the result is not a palindromic number, this is repeated until it gives a palindromic number. Such number is called "a delayed palindrome".

It is not known whether all non-palindromic numbers can be paired with palindromic numbers in this way.  While no number has been proven to be unpaired, many do not appear to be.  For example, 196 does not yield a palindrome even after 700,000,000 iterations. Any number that never becomes palindromic in this way is known as a [[Lychrel number]].

On January 24, 2017, the number 1,999,291,987,030,606,810 was published in OEIS as [[oeis:A281509|A281509]] and announced "The Largest Known Most Delayed Palindrome". The sequence of 125 261-step most delayed palindromes preceding 1,999,291,987,030,606,810 and not reported before was published separately as [[oeis:A281508|A281508]].