This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A320516 #129 Nov 10 2018 08:52:30 %S A320516 7774777,777767777,77777677777,99999199999,1111118111111, %T A320516 7777774777777,111111181111111,333333373333333,77777777677777777, %U A320516 99999999299999999,9999999992999999999,33333333333733333333333,77777777777677777777777,333333333333373333333333333 %N A320516 Palindromic wing primes that are also Lychrel candidates. %C A320516 Lychrel candidates are natural numbers that seem unable to form a palindrome through the iterative process of repeatedly reversing its digits and adding the resulting numbers. %C A320516 On January 23, 2017 a Russian schoolboy, Andrey S. Shchebetov, announced on his web site that he had found a sequence of the first 126 numbers (125 of them never reported before) that take exactly 261 steps to reach a 119-digit palindrome. That sequence was published in the OEIS as A281506. The trajectory of the last number of that sequence, 1186061987030929990, under the "Reverse and Add!" operation was published separately in the OEIS as A281507. %H A320516 Robert Liguori, <a href="https://bit.ly/2yIY6Mu">Github project SequencePier</a> %Y A320516 Cf. A077798, A000040, A023108, A281506, A281507. %K A320516 nonn,base %O A320516 1,1 %A A320516 _Robert James Liguori_, Oct 29 2018 %E A320516 Seven terms inserted by _Jon E. Schoenfield_, Oct 31 2018 %E A320516 a(14) from _Jon E. Schoenfield_, Nov 01 2018