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 A084093 #18 Feb 16 2025 08:32:49 %S A084093 1,4,8,9,121,343,1331,10201,14641,94249,1030301,104060401, %T A084093 900075181570009,10022212521222001,12124434743442121, %U A084093 12323244744232321,12341234943214321,1022321210249420121232201,1210024420147410244200121 %N A084093 Prime power decimal palindromes that are not prime. %C A084093 A084092 without A002385. %C A084093 a(n) = A072037(n-1) for n > 1. - _Georg Fischer_, Oct 19 2018 %H A084093 Donovan Johnson, <a href="/A084093/b084093.txt">Table of n, a(n) for n = 1..27</a> (terms < 10^30) %H A084093 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PalindromicPrime.html">Palindromic Prime</a>. %H A084093 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PrimePower.html">Prime Power</a>. %e A084093 a(9)=14641=11^4; a(10)=94249=307^2=A000040(63)^2; %e A084093 a(11)=1030301=101^3=A000040(26)^3. %Y A084093 Cf. A002385, A072037, A084092. %K A084093 nonn,base %O A084093 1,2 %A A084093 _Reinhard Zumkeller_, May 11 2003 %E A084093 a(13)-a(17) from _Donovan Johnson_, Feb 22 2008 %E A084093 Missing term 104060401 added by _Donovan Johnson_, Jul 02 2011