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 A117778 #9 Feb 16 2025 08:33:00 %S A117778 2,1,3,0,10,0,29,0,97,0,293,0,982,0,3385,0,11631,0,41375,0,152900,0, %T A117778 541525,0,1996031,0,7463249,0,27801721,0,102404054,0 %N A117778 Total number of palindromic primes in base 4 with n digits. %C A117778 Every palindrome with an even number of digits is divisible by 11 (in base 4) and therefore is composite (not prime). Hence there is only one palindromic prime with an even number of digits. %H A117778 Eric Weisstein: <a href="https://mathworld.wolfram.com/PalindromicPrime.html">Palindromic Prime</a>. %Y A117778 Cf. A029972, A117699. %K A117778 nonn,base %O A117778 1,1 %A A117778 _Martin Renner_, Apr 15 2006 %E A117778 a(13)-a(32) from _Chai Wah Wu_, Dec 27 2015