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 A307829 #6 Aug 11 2024 14:41:35 %S A307829 0,1,8,84,139,2528,42293,198891,712178,714154,826684,3628625,12999736, %T A307829 84439174,135593913,136500523,2527472528,2637951184,3960451966, %U A307829 4094127596,4415308953,5192254461 %N A307829 Base numbers of decagonal (10-gonal) palindromic numbers. %H A307829 P. De Geest, <a href="https://www.worldofnumbers.com/nona.htm">Palindromic nonagonals</a> %t A307829 Select[Range[0, 10^5], PalindromeQ[PolygonalNumber[10, #]] &] %Y A307829 Cf. A001106, A082723, A055560. %K A307829 nonn,base %O A307829 1,3 %A A307829 _Robert Price_, Apr 30 2019