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 A083837 #7 Aug 25 2014 12:11:22 %S A083837 1,1,1,1,1,1,1,1,6,1,55,0,5,7,8,2,0,3,4,5,1,5,0,5,4,5,2,5,3,4,0,1,7,5, %T A083837 4,5,0,2,8,3,0,0,1,8,4,7,9,0,2,2,0,6,0,1,2,7,6,161,7,2,0,6,8,0,1,9,3, %U A083837 8,7,2,0,7,8,0,2,1,3,4,0,2,0,7,4,6,2,0,1,4,6,2,0,8,4,6,2,0,3,1,6,1,0,9,0,3 %N A083837 Smallest palindrome n such that kn + 1 is a palindrome, or 0 if no such number exists. %C A083837 0 in sequence indicates no palindrome < 10^15 - _Ray Chandler_, Jul 13 2003 %e A083837 a(3) = 1: 3*1 + 1 = 4; a(11) = 55, 55*11+1=606. %Y A083837 Cf. A083829, A083830, A083832, A083834, A083835, A083838. %K A083837 base,nonn %O A083837 1,9 %A A083837 _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 09 2003 %E A083837 Corrected and extended by _Ray Chandler_, May 22 2003