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 A084843 #9 Dec 12 2019 14:12:46 %S A084843 919,1020,1029,1031,1038,1041,1047,1051,1061,1065,1071,1074,1081,1091, %T A084843 1101,1130,1131,1139,1141,1148,1151,1157,1161,1171,1175,1181,1191, %U A084843 1201,1231,1240,1241,1249,1251,1258,1261,1267,1271,1281,1291,1301,1314,1341 %N A084843 Numbers n such that no palindrome m > 0 exists with n + m also a palindrome. %e A084843 There is no palindrome x > 0 such that x + 919 (itself coincidentally also palindromic) is a palindrome. %Y A084843 Cf. A002113, A082272, A082273, A104444. %K A084843 nonn,base %O A084843 1,1 %A A084843 _Patrick De Geest_, Jun 08 2003