OUR SEQUENCES

A281509: Trajectory of 1999291987030606810 (the largest presently known “most delayed palindrome”) under the “Reverse and Add!” operation.

A281508: Numbers requiring exactly 261 ‘Reverse and Add’ steps to reach a palindrome.

A281506: First 126 numbers a(n) with exactly 261 ‘Reverse and Add’ steps needed to reach a palindrome.

A281507: Trajectory of 1186061987030929990 under the “Reverse and Add!” operation.

A281390: First 225 numbers with exactly 259 ‘Reverse and Add’ steps needed to reach a palindrome.

A281301: Trajectory of 1000004999700144385 under the “Reverse and Add!” operation.

PALINDROMES

The world record to turn a number into a palindrome in maximum steps
Most Delayed Palindrome World Record

LYCHREL NUMBERS AND PROBLEM 196

Wikipedia on Lychrel Numbers and Problem 196
Lychrel Number

Attempted solutions of Problem 196
196 and Other Lychrel Numbers

196 Palindrome Quest
The p196_mpi page

COLLATZ CONJECTURE

Wikipedia on Collatz Conjecture
Collatz Conjecture

Milestone article of Jeffrey Lagarias
The 3x+1 problem and its generalizations

PRIME NUMBERS

Wikipedia on the largest known prime number
The Largest Known Prime Number

GIMPS project to find the largest prime number
Great Internet Mersenne Prime Search

Russian GIMPS project team
Russian GIMPS

COMPS AND MATH

Euler was wrong!
 Article by Noam D. Elkies Disproving Euler’s Sum of Powers Conjecture