# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a043080 Showing 1-1 of 1 %I A043080 #7 Jul 20 2024 16:40:25 %S A043080 1,2,11,12,13,14,15,16,17,18,19,20,101,112,123,134,145,156,167,178, %T A043080 189,200,1001,1011,1021,1031,1041,1051,1061,1071,1081,1091,1102,1112, %U A043080 1122,1132,1142,1152,1162,1172,1182,1192,1203,1213 %N A043080 a(n)=(s(n)+9)/10, where s(n)=n-th base 10 palindrome that starts with 1. %t A043080 (#+9)/10&/@Select[Range[100000],PalindromeQ[#]&&IntegerDigits[#][[1]]==1&] (* _Harvey P. Dale_, Jul 20 2024 *) %K A043080 nonn,base %O A043080 1,2 %A A043080 _Clark Kimberling_ # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE