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.

On May 12, 2017 we officially added all 108864 (one hundred and eight thousand eight hundred sixty four) 19-digit 261-step delayed palindromes to our А281506 sequence in The Online Encyclopedia of Integer Sequences (OEIS). The extended sequence starts with 1186060307891929990 and ends with 1999291987030606810, that was named “The Largest Presently Known Most Delayed Palindrome”.

The number 1999291987030606810 registered in The On-Line Encyclopedia of Integer Sequences under А281509 remains the world record holder as “The Largest Presently Known Most Delayed Palindrome”.

All discovered delayed palindromes are currently available for download from OEIS as well as from our data repository.

The published sequence is complete – there is a theoretical confirmation for its size, composition and completeness.