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 A117701 #10 Feb 16 2025 08:33:00 %S A117701 2,3,5,11,101,111,141,151,515,525,10001,11311,11411,11511,12021,12121, %T A117701 13131,13531,14141,14341,15451,50105,51215,52225,52525,53035,53135, %U A117701 53535,54345,54445,55355,1004001,1005001,1015101,1021201,1034301,1041401,1054501,1111111,1123211,1133311 %N A117701 Palindromic primes in base 6 (written in base 6). %H A117701 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PalindromicPrime.html">Palindromic Prime</a>. %t A117701 Select[FromDigits[IntegerDigits[#,6]]&/@Prime[Range[6*10^3]], IntegerDigits[#] == Reverse[IntegerDigits[#]]&] (* _Harvey P. Dale_, Jul 05 2015 *) %Y A117701 Cf. A029974. %K A117701 nonn,base %O A117701 1,1 %A A117701 _Martin Renner_, Apr 13 2006