Our sequence of 19353600 record 288-step delayed palindromes is published as A326414 .
The sequence starts with 12000700000025339936491 (the number discovered by Rob van Nobelen on April 26, 2019), ends with 29463993352000000700020 and contains all terms known at present.
On 26 April 2019, Rob van Nobelen discovered the 23-digit number 12000700000025339936491 – the first one that takes record-breaking 288 steps to reach a final 142-digit palindrome. The previous record (261 steps) was set in 2005.
We expanded the found number to a sequence with 19353600 terms in total. This sequence currently includes all known 288-step delayed palindromes.
All results are contributed to OEIS and will be published in due course.
As we announced before, on April 23rd, 2017 our “1003 Palindrome Generator”, using proprietary theoretical algorithm, generated 108864 (one hundred and eight thousand eight hundred sixty four) 19-digit delayed palindromes with 261-step delay before achieving the 119-digit palindrome, each of which was independently tested and confirmed its properties. Continue reading
As we announced before, on April 22nd, 2017 our “1003 Palindrome Generator”, using proprietary theoretical algorithm, generated 430080 (four hundred and thirty thousand and eighty) 19-digit delayed palindromes with 260-step delay before achieving the 119-digit palindrome, each of which was independently tested and confirmed its properties. Continue reading
As we announced before, on April 21st, 2017 our “1003 Palindrome Generator”, using proprietary theoretical algorithm, generated 1620000 (one million six hundred twenty thousands) 19-digit delayed palindromes with 259-step delay before achieving the 119-digit palindrome, each of which was independently tested and confirmed its properties. Continue reading
On April 23nd, 2017 our “1003 Palindrome Generator”, using proprietary theoretical algorithm, generated 108864 (one hundred and eight thousand eight hundred sixty four) 19-digit delayed palindromes with record 261-step delay before achieving the 119-digit palindrome. Continue reading
On April 22nd, 2017 our “1003 Palindrome Generator”, using proprietary theoretical algorithm, generated 430080 (four hundred and thirty thousand and eighty) 19-digit delayed palindromes with 260-step delay before achieving the 119-digit palindrome. Continue reading
On April 21st, 2017 our “1003 Palindrome Generator”, using proprietary theoretical algorithm, generated 1620000 (one million six hundred twenty thousands) 19-digit delayed palindromes with 259-step delay before achieving the 119-digit palindrome. Continue reading
Our results for the large palindrome search and information on “The Largest Known Most Delayed Palindrome” appeared in Wikipedia in Lychrel Number article.
The number 1999291987030606810 found by us is officially included into OEIS as A281509 and named “The Largest Known Most Delayed Palindrome”. The 261-step trajectory of this number to a 119-digit palindrome is also published.
The discovered sequence of 126 19-digit numbers (all of them never reported before) that turn into a palindrom after 261 steps is officially included into OEIS as the sequence number A281508. The list of these numbers is also published. Continue reading
January 25, 2017: Moscow, Russia
On January 18-21, 2017 our “1001 Palindrome Finder” using proprietary intellectual algorithm scanned the range of 19-digit numbers from about 1,999,290,300,000,000,000 to about 1,999,292,000,000,000,000 (spanning over 1.7 trillion numbers) and found 126 numbers turning into a 119-digit palindrome after 261 iterations. Continue reading
The trajectory of the last out of 126 discovered by us 19-digit numbers, turning into a palindrome after 261 steps, is officially included in OEIS as A281507. The result after each of 261 steps is also published.